Abstract: A battery degassing unit for a battery housing has a base body that has a gas passage opening and is to be connected fluid-tightly to a pressure compensation opening of the battery housing. A first filter covers the gas passage opening at an inner side of the base body. The first filter is a separation grid with first grid openings. A second filter is a separation grid arranged between first filter and inner side of the base body and has second grid openings. The base body has fastening regions for fastening the battery degassing unit to the battery housing. One of the first and second filters completely engages across the gas passage opening. One of the first and second filters is a corrugated filter so that a length extension in a stretched state in at least one direction is at least 1.3 times as large as in a corrugated state.

Abstract: A filter cartridge includes a filter element (forming a fluid channel with a first longitudinal axis) with a front side to which a front end cap is sealingly attached, a conduit (with rear and front ends) attached to the front end cap, and a through hole (in the front end cap) that provides a fluid communication between the channel and the conduit, to enable oil flow from the channel via the rear end of the conduit through the conduit to its front end. Pressure drop for a given oil flow rate is reduced if the conduit has a straight end section (defining a second longitudinal axis) in the vicinity of its front end. The second longitudinal axis intersects the first longitudinal axis at a single point to define a non-zero angle ? between the axes.

Abstract: A fiber bed assembly used to remove aerosols and/or wetted soluble solids from a moving gas stream includes a fiber bed support and a fiber bed supported by the fiber bed support so that the gas stream passes through the fiber bed moving from an upstream space to a downstream space with respect to the fiber bed. A re-entrainment control device is located within a downstream space defined by the fiber bed so that at least a portion of the gas stream passes through the re-entrainment control device. The re-entrainment control device is shaped to change the direction of the average flow path of the gas stream as the gas stream passes through the re-entrainment control device so as to cause aerosols and/or wettable solids contained therein to be separated from the gas stream by inertial force. A re-entrainment control device and method of use are also disclosed.

Abstract: A versatile compact air precleaner, air cleaning method and disposable air filter cartridge for air precleaner for separating heavier-than-air particulate debris from debris laden air to provide a clean airflow, wherein a flow path for air passing through a separator chamber of the air precleaner is retroflexed en route to the outlet. A plurality of independently rotatably adjustable housing sections of a housing provide utility with multiple clean air outlet configurations, freedom of direction of ejection of particulate debris from the ejector ports, different inlet configurations, mounting of the precleaner from different sides, accommodation of different sizes of filters, and different clean airflow rate capabilities. A separator chamber end section including the ejector ports is connected to the filter as a removable, disposable air filter cartridge to obviate ejector port clogging with change of filters.

Abstract: In at least some embodiments, the present invention relates to an air cleaner having a housing portion, and a low profile rain cover having an opening on an underside of the cover to allow unfiltered air to enter into the air cleaner. Also, in at least some embodiments, the present invention relates to an air cleaner including a housing and an additional component by which the air cleaner is capable of being directly coupled to a carburetor inlet. In some such embodiments, one or more protrusions can be provided within a channel formed by the housing/additional component to influence air flow. Further, in at least some embodiments, the present invention relates to an air cleaner having a shaped wall formed on a housing portion, where the shaped wall includes both an interior surface and an exterior surface by which air flowing within the air cleaner is imparted with helical motion.

Abstract: Systems and methods to improve the separation of drill cuttings from drilling fluids using cyclone devices are described. Specifically, a system for separating three phases of a gas/liquid/solid mixture is described. The system includes a cyclone for separating the gas/liquid/solid mixture into a solids component and a gas/liquid mixture; a gas/liquid separator for separating the gas/liquid mixture into a gas component and a liquid component; and a vacuum system for providing a motive force for moving the gas/liquid/solid mixture into the cyclone, moving the separated gas/liquid mixture into the gas/liquid separator and for removing the gas component from the gas/liquid separator.

Abstract: Air filter assemblies and carrier frames have a plurality of vortex-generating flow guides normalizing air flow to a uniform velocity profile downstream thereof. The airflow having the uniform velocity profile travels across a mass airflow sensor.

Abstract: Methods and apparatus for preventing coke formation in a plenum are provided. The apparatus can include a turbulator for use in a plenum. The turbulator can include a deflector disposed inside the plenum proximate an inlet to the plenum from a cyclone, wherein the plenum and the cyclone are disposed in a fluid catalytic cracker.

Abstract: High molecular weight (HMW) gases are separated from an exhaust gas of a combustion source using a blower and an interior vent within the exhaust stack. The interior vent includes a vent wall having a top portion attached to the interior surface of the exhaust stack along the entire inner perimeter of the exhaust stack and a lower portion that extends downward into the exhaust stack to form an annular space or gap between the vent wall and the interior surface of the exhaust stack, and at least one opening in the interior surface of the exhaust stack between the top and bottom portions of the vent wall. The blower creates a tangential flow of the exhaust gas with sufficient centrifugal force to concentrate substantially all of the HMW gases along the inner surface of the exhaust stack. A transfer pipe removes the HMW gases from the interior vent.

Abstract: A versatile compact air precleaner, air cleaning method and disposable air filter cartridge for air precleaner for separating heavier-than-air particulate debris from debris laden air to provide a clean airflow, wherein a flow path for air passing through a separator chamber of the air precleaner is retroflexed en route to the outlet. A plurality of independently rotatably adjustable housing sections of a housing provide utility with multiple clean air outlet configurations, freedom of direction of ejection of particulate debris from the ejector ports, different inlet configurations, mounting of the precleaner from different sides, accommodation of different sizes of filters, and different clean airflow rate capabilities. A separator chamber end section including the ejector ports is connected to the filter as a removable, disposable air filter cartridge to obviate ejector port clogging with change of filters.

Abstract: High molecular weight (HMW) gases are separated from an exhaust gas of a combustion source using a blower and an interior vent within the exhaust stack. The interior vent includes a vent wall having a top portion attached to the interior surface of the exhaust stack along the entire inner perimeter of the exhaust stack and a lower portion that extends downward into the exhaust stack to form an annular space or gap between the vent wall and the interior surface of the exhaust stack, and at least one opening in the interior surface of the exhaust stack between the top and bottom portions of the vent wall. The blower creates a tangential flow of the exhaust gas with sufficient centrifugal force to concentrate substantially all of the HMW gases along the inner surface of the exhaust stack. A transfer pipe removes the HMW gases from the interior vent.

Abstract: A combination filter and register for a heating, ventilation, and air conditioning system includes a register mounted in a structure and a filter. The register includes a plurality of parallel blades and a plurality of vane members, with a space defined between the two. The register does not have a dedicated access opening. The filter includes a pliable rectangular frame with a pliable filter material spanning it. The pliable filter material and pliable frame allow the filter to be inserted between two of the plurality of parallel blades, or between one of the parallel blades and an edge of the register, for placement of the filter into the space between the blades and the vanes without removing the register from the structure in which it is mounted.

Abstract: A centrifugal separator for separating liquid droplets from a gas flow can be used for scrubbing gases to be emitted into the atmosphere, as well as for separating water, oil and gas condensate droplets from a gas flow in any industry. The separator comprises a cylindrical body with axial gas flow inlet and outlet pipes and separated liquid removal sections located on the end surfaces of the body. A swirler and a central perforated pipe are installed in series and in axial alignment in the body from the gas inlet side. A conical displacer is installed in the perforated central pipe. Separation stage vanes are located between the central pipe and the conical displacer along the entire length of the displacer, and hydraulic seal vanes are placed at the same level between the central pipe and the body. The separator design provides a more efficient separation of liquid droplets from a high-velocity gas flow and can operate in any position.

Abstract: An extension piece portion is provided at a lower end portion of a screen plate so as to extend from the lower end portion, beyond a gas-passing through hole, to an oil pocket portion. An oil guide portion is provided at respective gas-hitting-side face portions of the screen plate and the extension piece portion so as to guide oil trapped at the above-described face portions into the oil pocket portion. Accordingly, it can be prevented that part of the oil in the middle of dropping down into the oil pocket portion from the screen plate is carried away by the gas flow passing through the gas-passing through hole, so that the efficiency of oil trap can be improved.

Abstract: An air cleaner that filters air supplied into an engine may include a lower case that has an intake port through which external air flows inside, a filter that may be disposed in the lower case and filters and allows the air flowing inside through the intake port, and an upper case that may be coupled to an upper portion of the lower case and has an exhaust pipe to discharge the air filtered by the filter to the engine, wherein an inlet of the exhaust pipe may be formed inside the upper case and an outlet may be formed to be connected to the outside of the upper case, the inlet of the exhaust pipe may be divided into a first inlet and a second inlet, and a fan that controls the exhaust amount of air to the outlet of the exhaust pipe may be disposed in the second inlet.

Abstract: In at least some embodiments, the present invention relates to an air cleaner having a housing portion, and a low profile rain cover having an opening on an underside of the cover to allow unfiltered air to enter into the air cleaner. Also, in at least some embodiments, the present invention relates to an air cleaner including a housing and an additional component by which the air cleaner is capable of being directly coupled to a carburetor inlet. In some such embodiments, one or more protrusions can be provided within a channel formed by the housing/additional component to influence air flow. Further, in at least some embodiments, the present invention relates to an air cleaner having a shaped wall formed on a housing portion, where the shaped wall includes both an interior surface and an exterior surface by which air flowing within the air cleaner is imparted with helical motion.

Abstract: Solutions for improving efficiency of a filter device for use with a machine requiring clean airflow are disclosed. In one embodiment, the filter device includes: a filter housing about an airflow inlet of the machine, wherein the filter housing comprises an air-permeable filter media configured to filter particles from multi-directional airflow moving through a substantial portion of the filter housing into the airflow inlet.

Abstract: An air filter unit (1) for a carburetor (2) of a portable handheld work apparatus includes a filter element (3) and at least one clean air channel (10, 11) arranged between the filter element (3) and the carburetor (2). At least one condensation rib (29, 30, 31, 32) is arranged in the clean air channel (10, 11) running in flow direction.

Abstract: The present disclosure relates to a fabric filter system, which may be used for removing particulate matter from a gas, such as a combustion process gas. The filter system includes a fabric filter (3) which is placed in a filter compartment. From the filter, gas flows via a filter plenary space (5) to an outlet duct (7), where the gas exits. A flow control device controls the amount of air exiting through the outlet duct. The flow control device comprises a louver-type damper (17). This provides reliable and efficient control of the gas flow. A collar (21), connecting the plenary space (5) with the outlet duct (7), improves the gas flow into the duct.

Abstract: A cyclonic fluid separator has a tubular housing (10) in which the fluid is accelerated and swirl imparting means (2) for inducing the fluid to swirl through an annular space between the housing and a central body (1) mounted within the housing (10), which central body (1) is provided with resonance abatement means, such as: tensioning means (20,22) which apply a tension load to an elongate tail section (8) of the central body (1) such that the natural frequency of the central body (1) is increased; vibration dampening means (31,50,60), which inhibit vibration of at least part (8) of the central body (1); solid particles (31) arranged in a segmented tubular tail section (8) of the central body (1), a viscous liquid (50) arranged between a tubular tail section (8) of the central body (1) and a tensioning rod (51), apertures (60) drilled radially through a tail section (8) of the central body (1); and/or a low pressure fluid (80) injected through a central opening (82) in the central body (1).

Abstract: A filter, in particular for compressed gas systems, includes a filter top part having at least one inlet channel and at least one outlet channel and a filter bottom part having a filter element, wherein the filter top part has a pressure-resistant housing and an insert which is suited in an optimal manner to the course of the inlet and outlet channels.

Abstract: High molecular weight (HMW) gases are separated from an exhaust gas of a combustion source using a blower and an interior vent within the exhaust stack. The interior vent includes a vent wall having a top portion attached to the interior surface of the exhaust stack along the entire inner perimeter of the exhaust stack and a lower portion that extends downward into the exhaust stack to form an annular space or gap between the vent wall and the interior surface of the exhaust stack, and at least one opening in the interior surface of the exhaust stack between the top and bottom portions of the vent wall. The blower creates a tangential flow of the exhaust gas with sufficient centrifugal force to concentrate substantially all of the HMW gases along the inner surface of the exhaust stack. A transfer pipe removes the HMW gases from the interior vent.

Abstract: A separating apparatus for separating out particles, especially liquid droplets from a gas flow which comprises the particles, comprising a flow channel which conducts the gas flow and has at least one deflection region for deflecting the gas flow, and a collecting vessel for accommodating the particles, the flow channel also having a branch leading to the accommodation vessel for separating the particles out of the gas flow, is in accordance with the invention, characterized in that, in addition to the branch, a line opens into the accommodation vessel and connects the accommodation vessel to the flow channel in a fluid-conducting manner.

Abstract: A cyclone chamber for a vacuum cleaner includes a cylindrical wall defining an internal cavity. An inlet port extends tangentially from the wall such that air entering the cavity via the inlet port causes a cyclonic flow to develop within the chamber. An exit tube extends axially from the chamber and has a flared opening presented into the chamber. A vortex shield is centered axially within the chamber adjacent to the opening and extends radially from the opening toward the wall. The vortex shield forms a barrier to prevent in the most part, large but light weight particles, carpet fibers and the like from escaping into the exit tube.

Abstract: A gas-particulate filter canister includes a filter canister body and first and second canister end caps secured to opposing ends of the filter canister body. First and second filter cartridges are supported within the filter canister body for filtering a gas in series. The filter cartridges can be standalone units which are built independently and are installed into the filter canister body. The filter cartridges can be concentrically arranged and can include a particulate filter cartridge and a gas filter cartridge.

Abstract: In at least some embodiments, the present invention relates to an air cleaner having a housing portion, and a low profile rain cover having an opening on an underside of the cover to allow unfiltered air to enter into the air cleaner. Also, in at least some embodiments, the present invention relates to an air cleaner including a housing and an additional component by which the air cleaner is capable of being directly coupled to a carburetor inlet. In some such embodiments, one or more protrusions can be provided within a channel formed by the housing/additional component to influence air flow. Further, in at least some embodiments, the present invention relates to an air cleaner having a shaped wall formed on a housing portion, where the shaped wall includes both an interior surface and an exterior surface by which air flowing within the air cleaner is imparted with helical motion.

Abstract: An air purifier air outlet structure includes one or a number of air outlets located on the housing of an air purifier adjacent to the air output port of the air purifier, a shutting device fastened to the housing of the air purifier to block the air output port for enabling purified air to pass out of the air purifier through the air outlet and a breathing tube having its one end connected to the air outlet(s) and its other end terminating in a respiratory device for enabling a user to breathe in purified air from the air purifier through the breathing tube so that the air purifier can be used in an office, house, car, factory, hospital or any other place as a personal air purifier to provide purified air for breathing by the user.

Abstract: The present invention is related to the separator (dust chamber) for separating solid particles from vapor-gas mixture, particularly to the structure of the dust chamber belonging amongst installation of the plant processing the fossil fuels or materials containing organic matter. The dust chamber (1) for separating solid particles from vapor-gas mixture comprises main body (2) with inner refractory lining (7) arranged to the inner surface of said main body, first and second stage cyclones (3, 4), lamella compensators (18, 19), dust removal conduits (5, 15) and inlet conduit (13) of the vapor-gas mixture into the first cyclone (3). The main body (2) of the dust chamber (1) is manufactured in all height from the cylinder of equal diameter and first and second stage cyclones (3, 4) are placed outside of the main body (2) of the dust chamber (1).

Abstract: A filter device for filtering a gas flow is provided. The filter device having a wound or folded filter material web. It is provided that at least one end of the filter material web has or is connected to a section which is formed by a closed sheet metal section, wherein the closed sheet metal section has at least one recess for the inflow or outflow of gas into or out of the filter device.

Abstract: An apparatus for effecting separation of particles from a mixture of particles and gas, the apparatus comprises: a housing that defines therethrough a channel; an inlet in said housing to admit the mixture of particles and gas into the channel; a deflector in the channel; and a gas outlet port substantially parallel to a longitudinal axis of the channel and downstream of the deflector; wherein the deflector is shaped to direct the particles past the gas outlet port. A method of separation is also disclosed.

Abstract: A lattice structure for the passage of a first medium against a second medium with transverse webs and longitudinal webs, lattice openings with a clear width of ?300 ?m being arranged between the transverse webs and the longitudinal webs. On at least one side of the lattice structure, the transverse webs and/or the longitudinal webs have a rib arrangement of ribs projecting vertically to the lattice plane, at least one first group and a second group of ribs being arranged which differ from one another at least by their heights H1, H2 with H1>H2. A vessel with at least one water inlet window and an air outlet window, both windows being provided with the lattice structures.

Abstract: The present invention relates to a cyclonic separating apparatus and a vortex finder plate for use in a cyclonic separating apparatus, the vortex finder plate including a support structure and a plurality of vortex finder support flaps extending from the support structure, each vortex finder support flap comprising a vortex finder. At least one of the vortex finder support flaps is connected to the support structure by a hinge.

Abstract: In a moisture separator, a manifold that communicates with a steam inlet is disposed in a shell. A plurality of blowout outlets for steam is provided on a side of the manifold. A first support plate and a lower support frame are fixed to a lower part in the shell to compart a steam drift space and a drain path. A moisture separating element is provided corresponding to the manifold, and steam from which moisture is removed by the moisture separating element is heated by a group of heating tubes to flow as high-temperature reheat steam to the steam outlet. The moisture is led from the drain opening through the drain path to the drain outlet. A blocking plate blocks a part of the drain opening.

Abstract: The present invention relates to an extractor hood that comprises an extraction conduit and a delivery conduit, the first one housing an air treatment unit that extracts air through the lower mouth of the same conduit, and the second one housing an air treatment unit that produces a forced air flow with inside-outside direction, which is suitably conveyed by a deflector with downward inclination to generate a pneumatic screen above the cook top that conveys fumes rising from the cook top towards the lower mouth of the extraction conduit.

Abstract: A water preseparator (1) for steam turbine plants for the separation of water from the operating steam (SW) from a high-pressure steam turbine has a feed pipe (2) which extends over the starting section of a steam transfer pipe (4), wherein the two pipes are separated from each other by a gap (11) through which water (12) together with transporting steam (St) flow into a housing. The water discharges from the preseparator (1) via a water discharge pipe (6). the preseparator has structure for recycling of the transporting steam into the operating steam of the steam turbine plant, wherein this recycling structure has built-in fittings or a baffle (9) of the transporting steam, and also structure (4) for achieving a pressure drop, wherein the pressure drop exists between the gap (11) and a point at which the transporting steam is reintroduced into the operating steam (SW).

Abstract: An apparatus and method for separating components of a fluid containing liquid and gas comprises a housing having at least one elongate channel. Each channel has an inlet end, an outlet end and rounded walls enabling the fluid flowing through the channel to flow substantially free of turbulent flow. Each channel defines a spiral path through the housing and acts to separate the fluid flowing through the channel into a gas-depleted outer portion and a liquid-depleted inner portion. The apparatus includes a liquid outlet port for the gas-depleted outer portion and a gas outlet port for the liquid-depleted inner portion. The housing may include a mixing chamber in fluid communication with the inlet end of the channel. The mixing chamber may include a surface the fluid impacts against. The apparatus may include a chamber at the outlet end of the channel. The chamber may have a gas outlet port closer to the outlet end of the channel than the liquid outlet port.

Abstract: A cyclone dust collector includes a cyclone body including a first cyclone chamber to centrifugally separate dust from drawn-in air for a first time, a plurality of second cyclone chambers to centrifugally separate dust from the drawn-in air for a second time, and a plurality of discharge ports to cause the drawn-in air to be discharged from the plurality of second cyclone chambers; an upper cover to cover an upper portion of the cyclone body, the upper cover having an inner wall facing the plurality of discharge ports; and a noise reduction part disposed between the plurality of discharge ports and the inner wall of the upper cover, to reduce noise generated inside the upper cover by the air discharged through the plurality of discharge ports. Therefore, it is possible to reduce noise generated inside the upper cover of the cyclone dust collector.

Abstract: A separating apparatus for separating out particles, especially liquid droplets from a gas flow which comprises the particles, comprising a flow channel which conducts the gas flow and has at least one deflection region for deflecting the gas flow, and a collecting vessel for accommodating the particles, the flow channel also having a branch leading to the accommodation vessel for separating the particles out of the gas flow, is in accordance with the invention, characterized in that, in addition to the branch, a line opens into the accommodation vessel and connects the accommodation vessel to the flow channel in a fluid-conducting manner.

Abstract: Cyclone collector including a primary cyclone (1) having a first inlet (14) for drawing external air, and a first outlet (14) for discharging air, a secondary cyclone (3) connected to the primary cyclone (1), and flow guide means (200) over the first outlet for preventing a flow direction of the air discharged from the first outlet (14) from turning sharply.

Abstract: An assembly for collecting material that is entrained in a gas stream comprises a housing defining a space within it, the housing having inlet and outlet ports for the gas that is to be filtered. The assembly includes a flow conduit which has a first conduit opening for communication with one of the ports and a second conduit opening for communication with the space within the housing. The axis of the first conduit opening and the axis of the second conduit opening are not aligned. The flow conduit contains at least one vane positioned within it so that the flow of gas along the conduit between the first and second conduit openings passes over the vane and is smoothed by it.

Abstract: A dust separating apparatus is provided. The dust separating apparatus draws in an external air stream and separates dust particles from the drawn air stream. The dust separating apparatus may include a dust collecting space to store dust particles and a driving means to increase or decrease the dust collecting space. Accordingly, a user may adjust the capacity of the dust collecting space as desired.

Abstract: A cyclonic separating apparatus includes a chamber for separating dirt and dust from an airflow, an inlet to the chamber and a shroud. The shroud includes a wall having inner and outer surfaces and a multiplicity of through-holes forming an outlet from the chamber. Each through-hole has an axis. The inner surface of the wall has a serrated profile having a plurality of serrations arranged around at least a part of the circumference of the wall, each serration having a first face and a second face. At least one through-hole passes through the first face of at least one serration. By providing a plurality of serrations around the inner circumference of the wall, the airflow is forced to follow a longer path through each through-hole for when compared to conventional arrangements. This reduces the amount of dirt and dust which is able to pass through the shroud.

Abstract: Apparatuses and methods are provided for removing dust particles from air circulating within a mowing machine, such as a lawn mowing machine, including a housing, a handle attached to the housing, a prime mover attached to the housing, and a grassbag employing a cyclonic separator. A grassbag apparatus can be provided that can include a grass clippings chamber for collecting blades of grass that have been cut and a dust collection chamber for removing and collecting dust-filled air from the air circulating within the lawn mowing machine. The dust collection chamber can include a cyclonic separator and a dust collection receptacle, wherein the cyclonic separator can be configured to remove dust particles from air circulating within the grassbag apparatus.

Abstract: Disclosed herein is a cyclone for separating fine particles from a gas. The cyclone includes a cyclone body having an upper end with an inlet and a lower end with a particulate outlet, gas outlet tube with an upper end that extends upwardly into the lower end of the cyclone body, and a vortex breaker. The upper end of the gas outlet tube is connected to the lower end of the cyclone body by a slip joint. The configuration of the cyclone provides for efficient removal of fine particles as compared to conventional techniques. A vessel containing cyclones, and methods of separation using the cyclones and vessel, also are disclosed.

Abstract: A device for intermediate storage of condensation water includes a swirl body which causes an inflowing air-water mixture to rotate, and a venturi tube through which the air-water mixture leaves the device. A ring groove in which water accumulates because of the swirl is arranged downstream of the swirl body, and water accumulated in the ring groove is sucked into the venturi tube via one more suction pipes. An expansion zone has an expanded cross-section and a step shaped interior for generating increased surface adhesion. Separating metal sheets in the expansion zone brake the swirl, bind the accumulated gushing water by adhesion forces, and guide it by capillary forces to the interior surface of the expansion zone. Gushing water accumulated at the ends of the separating metal sheets is drained by one or more suction pipes, into the venturi tube.

Abstract: A device is provided that is capable of circulating air throughout a personal space as well as collecting and preventing the build up of dust and other particulate matter by drawing in air from the surrounding environment and removing some dust, allergens and other such particulate matter therefrom. The filtered air is then expelled out of the device and back into the surrounding environment. The device includes a housing defining an interior space having a motor and fan assembly disposed therein. The housing includes an inlet with a filter provided therein such that air drawn in through the inlet is filtered. The air is then expelled through a circumferentially disposed outlet. The filter element preferably includes a lock and key system configured to prevent operation of the device in the absence of a properly keyed filter.

Abstract: A particle separator which broadly includes: an inner wall, an outer wall and a splitter, wherein the inner and outer walls define an air intake passageway, and wherein the splitter is positioned between the inner and outer walls so as to define a scavenge air flow passageway connected to the intake passageway and a main air flow passageway connected to the intake passageway; the inner wall having a humped-shaped portion between the intake passageway and the main air flow passageway; the humped-shaped portion having a peak and a radius of curvature at any point on the hump-shaped portion of the inner wall after the peak corresponding to a degree of curvature of from about 30 to about 60 degrees; and a boundary layer control mechanism for providing active boundary layer control along the inner wall after the peak and within the main air flow passageway. Also provided is a method for providing active boundary layer flow control along the inner wall after the peak and within the main air flow passageway.

Abstract: A cyclonic separating apparatus includes a separating chamber, an inlet communicating with the separating chamber and an outlet formed by a conduit communicating with an interior portion of the separating chamber and having a longitudinal axis, wherein a single planar baffle projects radially inwardly from an interior surface of the conduit towards the longitudinal axis. The presence of the baffle in the outlet has the effect of reducing noise generated by the apparatus when in use and also improves pressure recovery.

Abstract: A foreign particle eliminating function and durability of an engine may be improved by an intake duct system having a cyclone duct including a cyclone module for generating torque of air, wherein the cyclone module includes: a central shaft; a plurality of cyclone blades that are formed outward from the central shaft; and a turbulence preventing device that is formed at a downstream side of the central shaft of the cyclone module so as to prevent turbulence of the air that has passed the cyclone blade.

Abstract: A cyclonic separating apparatus includes a chamber for separating dirt and dust from an airflow, an inlet to the chamber and a shroud. The shroud includes a wall having a multiplicity of through-holes forming an outlet from the chamber, each of the through-holes having substantially rectangular cross-sections with width to height ratios in the range of 1.5:1 to 1:1.5. The rectangular cross section of the through-holes maximizes the available through-hole area in the shroud, produces a low pressure drop across the shroud and reduces the amount of material required for manufacture. Further, this ratio allows the cross-sectional area of the through-holes to be dimensioned to prevent larger particles of dirt and dust from passing through the through-holes in the shroud, while still providing the required structural integrity.