Abstract: A propulsion system for an aircraft includes a core engine that includes a core flow path where air is compressed in a compressor section, communicated to a combustor section, mixed with a hydrogen based fuel and ignited to generate a core gas flow that is expanded through a turbine section. The propulsion system includes a hydrogen fuel system that is configured to supply hydrogen fuel to the combustor through a fuel flow path, a condenser that is arranged along the core flow path and configured to condense water within the core gas flow, and a separator that includes an inlet, a primary water outlet and an exit that includes a plurality of exit guide vanes for straightening the core gas flow that proceeds through the exit. The exit guide vanes include a secondary water outlet for removing condensed water in the core gas flow that proceeds through the exit.

Abstract: A water separator for use in a marine exhaust system comprises a horizontally disposed, generally cylindrical housing including a wet exhaust inlet, a dry exhaust outlet, and a water outlet. Wet exhaust entering the wet exhaust inlet is constrained against the inner housing wall by a variable geometry vane or baffle which causes the wet exhaust to accelerate such that centrifugal force causes the entrained water to separate from the exhaust gas. Separated water encounters a longitudinally disposed barrier and flows to the water outlet for discharge from the vessel. A tubular dry exhaust pipe is longitudinally disposed within the housing and includes an inlet disposed in proximity to a first end thereof, and an outlet projecting from a second end thereof.

Abstract: A packaging system for enclosing an aftertreatment module associated with an engine is described. The packaging system includes a housing structure configured to enclose the aftertreatment module therein, the housing structure being coupled to an exhaust conduit of the engine. The housing structure includes a base portion and a plurality of side portions extending from the base portion. The base portion and the plurality of side portions define a chamber for receiving the aftertreatment module therein. Further, the packaging system includes a equipment rack configured to receive one or more components of the accessory system. The equipment rack includes a top end and a bottom end, the top end being distal from the bottom end and configured to couple with the base portion of the housing structure. The bottom end of the equipment rack is supported on a floor.

Abstract: A device for and methods of reducing sound vibrations in a liquid resulting from a sound source arranged below the liquid level of a body of water are disclosed. The device includes an elongate tube which can be arranged over the sound source, the tube comprising an outer wall and inner wall with an intermediate space between the inner and outer wall.

Abstract: A marine muffler comprises an elongate cylindrical housing having an inlet and an outlet and defining an internal volume partitioned, by an angularly disposed internal baffle, into a lower chamber in communication with the inlet and an upper chamber in communication with the outlet. A vertically disposed duct is insertably secured to the baffle to allow exhaust gas and exhaust cooling water to flow from the lower inlet chamber to upper outlet chamber. The exhaust duct may preferably be further adapted with internal structure forming a plurality of individual flow conduits or passages. The duct is preferably positioned such that a plurality of flow passage inlets are positioned in proximity to the lower cylindrical housing wall, with flow passage outlets positioned in proximity to the upper housing wall. The lower duct wall may further be adapted with sidewall apertures for improving exhaust flow dynamics therethrough.

Abstract: A muffling chamber is located between a first main body wall and a second main body wall with respect to a height direction. An outflow pipe includes: a first opening that connects an outflow passage with a muffling chamber in the vicinity of a first main body wall; and a second opening that connects the outflow passage with the muffling chamber in the vicinity of a second main body wall. The liquid staying on the first main body wall of a first muffler flows into the outflow passage through the first opening. The liquid staying on a second main body wall of a second muffler flows into the outflow passage through a second opening. Therefore, the symmetry of the first muffler and the second muffler is compatible with anti-corrosion.

Abstract: In an acoustic fluid machine, an acoustic resonator gradually reduces in diameter towards the top on which a valve device is provided to suck a gas into the resonator. The gas is compressed in the resonator by a circular-plate piston at the lower end of the resonator and discharged via an outlet of the valve device. The piston comprises a rubber plate fixed to the resonator and a metal plate attached on the rubber plate.

Abstract: In a fluidal machine with an impeller rotating to urge a fluid radially outwardly by a centrifugal force, a vane guiding the fluid discharged from the impeller, a vane member which includes a front end of the vane facing to the impeller so that the fluid discharged from the impeller strikes against the front end and which is prevented from contacting the atmosphere, and a casing surrounding the vane member and contacting the atmosphere, the vane member is discrete from the casing, a vibration propagation between the vane member and the casing is prevented or restrained, and a vibration of a pipe extending from the casing is absorbed.

Abstract: A silencer is disclosed that reduces the acoustic energy of a fluid mixture of a liquid coolant and of exhaust gas from an engine. The engine may be a marine engine. The silencer according to this aspect includes a receiving chamber that receives the fluid mixture and exhaust gas, at least one lifting conduit; and a separation chamber. The lifting conduit has a receiving portion with a first opening and an expelling portion with a second opening. The receiving portion is fluidly coupled with the receiving chamber so that the fluid mixture enters the first opening from the receiving chamber and is lifted through the lifting conduit to the expelling portion. This lifting may be accomplished, at least in part, by dynamic effects. The separation chamber is fluidly coupled with the second opening of the lifting conduit, and has at least one interior surface.

Abstract: A marine engine muffler is provided having a silencing element with an inclined surface defining an array of elongate slotted apertures generally disposed in circumferential alignment. The slotted apertures are preferably defined by angled sidewalls such that exhaust gas flowing therethrough is forced to travel in a path that forms a reverse angle relative to the overall exhaust flow path thus conducting exhaust gases and entrained water to reverse direction while flowing through the silencing element. The conical silencing element is specifically sized to avoid resonant vibration within the operational RPM range of the engine and is further sized relative to the combined displacement of the engine and/or cylinder bank in fluid communication therewith to avoid resonant vibrations caused by reflected exhaust gas pressure waves generated by the internal combustion engine.

Abstract: A waterlift silencer and method for reducing the acoustic energy of a fluid mixture of engine exhaust gas and a liquid coolant and limiting back pressure exerted by the silencer on an engine, particularly as applied to engines located below the waterline of a marine vessel. The silencer has two or more mixture-expelling conduits through which the fluid mixture is dynamically lifted above the silencer to a point above the waterline. The mixture-expelling conduits are sequentially operated in order to maintain exhaust gas volume flow rates high enough to partially atomize the liquid and thus allow it to be expelled upward, while maintaining a minimal back pressure on the engine throughout the full range of normal engine operating speeds. Two mixture-expelling tubes may be used.

Abstract: Embodiments of personal watercraft that incorporate improved exhaust silencing systems. The silencing systems include an exhaust silencer that silences higher frequency sounds that are difficult to silence with expansion chambers. The silencer is positioned between the water trap and the atmospheric discharge and is disposed substantially vertically so as to facilitate drainage of any water therefrom and to provide further assurances that water cannot enter the engine through the exhaust system.

Abstract: An exhaust system is provided with a structure that separates water from an exhaust stream and also attenuates the noise of the exhaust system. Water laden exhaust is directed from an inlet conduit through a perforated surface to precipitate water from the water laden exhaust stream. After the water is precipitated out of the exhaust stream, the gaseous portion of the exhaust stream continues from the inlet chamber 24 to an outlet chamber 28 and exits from the housing structure by passing through a first outlet conduit. The precipitated water passes from the housing structure through a second outlet conduit.

Abstract: An apparatus and method for silencing marine engines. In one embodiment, a separation chamber receives a fluid mixture of exhaust gas and liquid coolant and a dynamic separation member separates the exhaust gas from the liquid coolant. In one aspect of the invention, a horizontal axial-flow silencer includes a separation plate, having at least one dynamic separator, horizontally positioned in the separation chamber. A dam maintains the free surface of the fluid mixture at or slightly above the separation plate at an engine speed within nominal operating range, and provides for the continuing passage of exhaust gas through the liquid coolant. The separation plate employs inertial effects introduced by a series of vanes that deflect the gas-coolant mixture upstream to separate the coolant with a greater inertia from the exhaust gas with a lesser inertia. Alternatively, the separation plate may consist of a mesh pad that employs frictional effects to achieve a similar result.

Abstract: A silencer is provided for a marine diesel engine. The silencer comprises a conical silencer element (20) located within an exhaust duct (10), the silencer element having apertured surfaces which are inclined to the flow of exhaust gases in the duct.

Abstract: A combined wet marine exhaust muffler and water separator comprises a housing having a tangential inlet for inducing the exhaust flow to rotate about a lengthwise axis of the housing, a first outlet positioned along the axis for conducting dried exhaust gas from the housing, and a second outlet positioned near a bottom end of the housing and spaced from the tangential inlet and the first outlet for draining water from the housing.

Abstract: An exhaust pipe construction for a motor vehicle includes a connecting device, a discharge device, and a filter disposed between the connecting device and the discharge device. The connecting device is a tee tube having a first port connected to an exhaust port of the engine compartment the motor vehicle, a second port connected to an intake port of the filter tank and a third port opened to the outside environment. The filter tank has a space for accommodating at least one filter unit. The filter tank has the intake port at a front end thereof and a discharge port at a rear end thereof, the discharge port being connected to the discharge device. The space inside the filter tank accommodates treated alkaline water of a predetermined amount. The filter unit has two guide tubes and three fork tubes, all of which have inlets at a baffling frame behind the intake port.

Abstract: A marine engine exhaust system (10) and method for use with a marine engine. The exhaust system (10) includes a muffler body (20) defining an internal cavity (22) for receiving exhaust gases from a marine engine (12), the cavity (22) defining a reservoir portion (28) for holding water. The exhaust system (10) also includes at least one inlet passageway (24) communicating with the cavity (22) for receiving exhaust gases from the engine (12) and communicating them to the cavity (22). At least one water supply passageway (32) is provided which communicates with the cavity (22) and which is placed in fluid communication with a water supply such that water can be communicated to the reservoir portion (28). Further, at least one outlet passageway (40) is provided through which exhaust gases and water are ejected from the cavity (22). The outlet passageway (40) has an inlet port (42) disposed in the reservoir portion (28) of the cavity (22) and has an outlet port (44) exterior to the muffler body (20).

Abstract: A marine engine exhaust system and method utilizes first and second enclosed, generally tubular chambers having generally parallel lengthwise dimensions and internal intermediate exhaust passageways spaced along the lengthwise dimension of the second chamber for circulating the exhaust gases through the first chamber, laterally through the intermediate exhaust passageway into the second chamber, along the lengthwise dimension of the second chamber and thence out of an outlet exhaust passageway which passes through the second chamber wall. An outer portion of the second chamber is integrally formed with an outer portion of the first chamber to enhance structural integrity.

Abstract: A marine engine exhaust system and method utilizes first and second enclosed, generally tubular chambers having generally parallel lengthwise dimensions and internal intermediate exhaust passageways spaced along the lengthwise dimension of the second chamber for circulating the exhaust gases through the first chamber, laterally through the intermediate exhaust passageway into the second chamber, along the lengthwise dimension of the second chamber and thence out of an outlet exhaust passageway which passes through the second chamber wall. An outer portion of the second chamber is integrally formed with an outer portion of the first chamber to enhance structural integrity.

Abstract: Sound muffling devices for marine engines for installation on the external portion of the transom of a marine vessel are attached in such a manner that any breakdown within the silencer causes no discharge of exhaust gases or cooling fluids into the interior of the vessel and the gases and cooling fluid continue to be discharged overboard. The silencer is designed to reduce, substantially, the noise level emitted by the engine under operation by the efficient mixture of gases and water through a series of baffles, with low resistance to gas flow that does not diminish engine efficiency. The gases and odors are emitted from the vessel at the centerline with distance and direction such as to reduce, substantially, emissions into the air environment. The device receives exhaust gas and cooling water from an exhaust pipe passing through the transom at the side of the boat and directs the gas athwart the boat to the center where it is exhausted.

Abstract: An exhaust relief system for an outboard motor includes an exhaust chamber into which exhaust is discharged from the engine. A first passage in communication with the exhaust chamber provides contraction of the exhaust as the exhaust passes rearwardly, from which the exhaust is discharged into an expansion chamber which substantially surrounds the exhaust chamber. From the expansion chamber, the exhaust is routed through and contracted into a second passage in communication with the expansion chamber, after which it is discharged to atmosphere. The tortuous path provided by the exhaust relief system of the invention, along with the repeated expansion and contraction of the exhaust as it flows to atmosphere, provides a muffling effect at idle operation.

Abstract: A marine engine exhaust system and method utilizes first and second enclosed, generally tubular chambers having generally parallel lengthwise dimensions and internal intermediate exhaust passageways spaced along the lengthwise dimension of the second chamber for circulating the exhaust gases through the first chamber, laterally through the intermediate exhaust passageways into the second chamber, along the lengthwise dimension of the second chamber and then out of an outlet exhaust passageway which passes through the second chamber wall and may also extend through a cooling water-collecting portion of the first chamber to achieve maximum muffling of the exhaust gas noise.

Abstract: A flat, box-like muffler formed of metal upper and lower housing sections and internal gas passage defining plates has drainage holes to allow liquid that collects on the top of the muffler or on the bottom of the lower section inside the housing to drain out of the muffler. A special sound attenuation structure comprising passages pressed in the plates and support channels in the housing sections is shown.

Abstract: A draining device for a muffler of a small planing boat in which engine cooling water is injected into the muffler. A draining hole is opened in the muffler, and to aforesaid draining hole is connected one end of a bypass hose with the other end opened to outside waters at a hull rear section.

Abstract: An apparatus and method for changing the optical and/or physical properties of a fluid composition employ an electric field applied across the fluid for controlling the fluid properties. The fluid consists of a dielectric liquid and an electrically conductive, elongated, fibrous particulate material. The fibrous material has a length between approximately 1000 angstroms and five millimeters, a diameter less than about 700 angstroms, and an aspect ratio of length to diameter greater than about five. The particulate material is in colloidal suspension in the liquid. Generally, when the particles are dispersed in the liquid by Brownian movement forces, the fluid composition has an average separation between particles of approximately three to ten or more times the average length of the particulate material.

Abstract: An exhaust gas silencing assembly or unit of the wet-type receives the exhaust gases from a water cooled internal combustion engine used to power a water-going vehicle, such as a speed boat, and the coolant water from the water jacket of the engine. The exhaust gas and water mixture may be expelled through a downwardly directed combined exhaust gas and water outlet of the silencing unit, or in response to opening a valve in an exhaust flow tube of the unit, exhaust gases and some of the water may be expelled directly out an outlet opening of the silencing unit. When the water and exhaust gases are expelled downwardly into the turbulent waters and foam of the wake of the boat the level of sound emanating from the silencing unit is substantially minimized. Upon opening of the valve at an outlet end of the silencing unit to provide straight through fluid flow the sound level of the engine is at a maximum, but the back pressure imposed on an engine is at a minimum for providing maximum engine performance.

Abstract: A silencer comprises a chamber with internal baffles mounted on a rod so that they can be manually reciprocated to scrape deposits off the chamber wall. A head at an end of the rod protruding from the chamber is screwable to a chamber end wall to hold the rod and baffles fixed during normal operation of the silencer. Loose material is expelled through a drain plug. The inlet and outlet are provided by a single through pipe which houses a tube separated into compartments by a partition. Gases enter the upstream compartment and flow through perforations in the tube and pipe into the chamber interior, then into an inverted trough through further perforations into the downstream compartment and the outlet. The chamber may be partly filled with water or a liquid cleanser, and may have cooling means.

Abstract: A draining device used in a car muffler includes a muffler body separated into three compartments A, B and C with water passing holes disposed to their bottoms, an inlet pipe communicated to the compartment B, two intermediary pipes used to communicate the exhaust gas between the compartments B and C, and C and A, an outlet pipe communicating with the compartment A which is disposed at the front side of the muffler, and a water drain path having inlet port opened to the bottom of the front side compartment A and outlet port opened to the surrounding portion of the outlet pipe.

Abstract: An outboard engine has a casing, an internal combustion engine with a water cooling circuit and an exhaust pipe. The exhaust pipe discharges exhaust gases into an expansion chamber, and gases from the expansion chamber are discharged into the body of water in which the vessel propelled by the engine floats. The exhaust pipe projects into the expansion chamber and has pores (perforations) near its outlet end. Coolant water is discharged into the expansion chamber and mixes with the exhaust gases. Gas flow through the pores discourages reverse flow of water droplets through the exhaust pipe to the engine cylinders.

Abstract: An exhaust silencer system for piston type internal combustion engines hag a wet-exhaust, having a muffler and a muffler bypass which contains water at slow and moderate engine speeds, the water being expelled by the exhaust gas pressure at high engine speed, opening said bypass to the flow of exhaust gases thus reducing the exhaust back pressure occurring in the muffler.