Abstract: An internal combustion engine includes an intake camshaft, a vacuum pump, an oil pump, and an oil feeding passage serving as an oil supplying path. The vacuum pump includes a rotor and a housing. The vacuum pump is formed with a negative pressure chamber that generates a negative pressure, and an oil path connected to the negative pressure chamber. An atmosphere communication hole for supplying air to the negative pressure chamber through the oil feeding passage and the oil path when the vacuum pump is stopped is arranged in the oil feeding passage. The atmosphere communication hole communicates the negative pressure chamber and the atmosphere before an amount of oil in the housing exceeds an allowable oil amount when the vacuum pump is stopped.

Abstract: A decompression assembly (12) and method can include a linkage mechanism (20), a biasing assembly (38) for normally biasing the linkage mechanism toward a locked position when an internal combustion engine (10) is in an unpowered state, and an actuating piston (44) for driving the linkage mechanism from the locked position toward the unlocked position when the engine (10) is in a powered state. The engine can include a cam lobe (70) for driving pivotal oscillation of a rocker arm (36) engageable with a valve (16) in the engine for movement between open and closed positions. The linkage mechanism allows a full range of movement of the rocker arm when in an unlocked position, and restricts movement of the rocker arm to less than a full range of movement when the linkage mechanism is in a locked position for maintaining the valve in a partially open position.

Abstract: A method and a kit for oil removal or injection into the oil pan of a vehicle, marine or aircraft engine. A modified dip stick tube extends to the bottom of the oil pan has at least one or more openings at its bottom end to allow oil to enter or exit. The top has an air-tight seal that can be attached to a flexible tube that can be run to a peristaltic pump. The pump can have an exit tube that runs into an oil recovery receptacle. After draining, the oil, the tube can be valved or physically relocated to a fresh oil source. The direction of rotation of the pump can be reversed to fill the oil pan with fresh oil. An electric control can run the pump in both a forward and reverse direction typically from a vehicle battery voltage source.

Abstract: A gasoline powered engine configured to operate in a substantially horizontal orientation and to be stored in a generally vertical orientation without leaking of fluid contained in the gasoline powered engine may include an oil sump and a first oil drain port extending in a first direction through a first wall of the sump. The first wall forms a bottom of the sump when the engine is in the vertical orientation.

Abstract: A method for diagnosing a lack of engine oil includes determining, by a controller, whether an oil level of an engine is normalized from an insufficient state to a normal state using an oil level switch. When it is determined that the oil level is normalized to the normal state, a driving mode of a vehicle is confirmed. When it is confirmed that the driving mode of the vehicle is an engine off driving mode, a diagnosis of the oil level is stopped.

Abstract: An exhaust silencer for a motor vehicle is provided. In one example, the silencer comprises a noise-reducing structure and a heat sink to transfer heat from exhaust gases to the exterior of the silencer, the heat sink comprising two regions of fins which define a plurality of flow channels through the heat sink, the flow channels directing the flow of exhaust through the silencer from an inlet passage to an outlet passage. In this way, a temperature of the exhaust is reduced, and the silencer and downstream components of an exhaust system may be constructed of materials of a lower thermal tolerance.

Abstract: A method for operating a drive device, which has a catalytic converter with an oxygen accumulator for purifying exhaust gas, includes determining upstream of the catalytic converter a pre catalytic converter molecular mass of a first substance and a pre catalytic converter molecular mass of oxygen; determining a post catalytic converter oxygen molecular mass by applying a first reaction equation which describes a reaction of the oxygen with the first substance, a second reaction equation, which describes a reaction of the first substance with oxygen stored in the oxygen accumulator, and a third reaction equation which describes an introduction of oxygen from the exhaust gas into the oxygen accumulator, wherein a reaction speed of the second reaction equation and a speed of the third reaction equation is a function of a load state of the oxygen accumulator

Abstract: A method of removing sulfur from a lean NOx trap of a mild hybrid vehicle while the vehicle is stationary is disclosed, the method comprising connecting an electrical system of the vehicle to a large capacity external battery, operating an integrated starter generator driven by an engine of the vehicle as a generator to load the engine thereby allowing the engine to be operated at a higher torque level and rich of stoichiometric and storing the electrical energy produced by the integrated starter generator in the large capacity battery during the time period required for the removal of sulfur from the lean NOx trap.

Abstract: The system for use in a vehicle, comprises a decomposition unit (20) for at least partial decomposition of a compound under catalysis of a biological catalyst. The system is further provided with a storage unit (30) for storage of biological catalyst, and with a dosing device (31) for transferring biological catalyst into the decomposition unit (20).

Abstract: Implementations described herein relate to utilizing discrete transient local state space models to modify an output from a steady state NOx estimation model to provide a final estimated NOx value. An engine operating space, defined by a speed and injection quantity map, is subdivided into several discrete local state spaces and a transient model is developed for each discrete state space to output a NOx estimation correction value. The transient models may be a regression model or the transient model may be an empirical map of data values. The NOx estimation correction value modifies a steady state NOx value to calculate the final NOx estimated value. The final NOx estimated value is then output to another component, such as a controller as an input for controlling one or more components of an engine, an aftertreatment system, and/or a diagnostic system.

Abstract: The system for use on board of a vehicle comprises a decomposition unit (2) for decomposing a compound under catalysis of a biological catalyst (3). The compound is for instance an ammonia precursor, and the biological catalyst is in solid form. At least one transfer means is present for transferring one of said compound and biological catalyst towards and/or away from the other one. The transfer means are for instance a moving device (15), for instance in the form of a float.

Abstract: An injector for delivering a working fluid into a working environment is disclosed. According to one embodiment of the present invention, the injector includes a pre-metering chamber with a control valve controlling fluid delivery rate and a swirl chamber, in which a swirling flow is created and atomization is achieved at low injector pressure when it is released. In another embodiment, the injector includes a swirl chamber and an atomization element with a bore, through which a control valve is positioned. The control valve forces a working fluid flow through the atomization element when the injector is energized to create a metered swirling flow. To avoid issues with deteriorated working fluid, a purging apparatus is used for emptying working fluid residue in the injector, and a special control method is used when the injector works in a high-temperature working environment.

Abstract: An assembly for treating gaseous emissions includes a substrate body having cells for the passages of emissions gas. Lengths of metal wire are located in selected ones of the cells and an induction heating coil is mounted adjacent the substrate body for generating a varying electromagnetic field for inductive heating of the assembly including gaseous emissions passing along the cells. Within the cells, parts of the cell walls and parts of the wire surfaces are exposed to the passage of the gaseous emissions and both the cell wall parts and the wire surface parts have pollution treating catalyst at their surfaces.

Abstract: An exhaust after-treatment system for mitigating deposition of urea utilizing selective catalytic reduction (SCR) in exhaust receiving communication with an exhaust gas stream produced by an engine system, including an exhaust passage including a mixing duct through which the exhaust gas stream flows. A fluid reservoir contains a urea solution and a fluid pump is fluidly connected to the fluid reservoir to draw the urea solution from within the fluid reservoir. A fluid injector is configured to receive the urea solution from the fluid pump and deliver the urea solution into the mixing duct and at least one vibration mechanism is mechanically coupled to one or both of the fluid injector and the mixing duct to generate and convey vibrations thereto to mitigate the deposition of urea.

Abstract: A vehicle exhaust component includes a first exhaust component, a second exhaust component downstream of the first exhaust component, and a mixer that connects an outlet of the first exhaust component to an inlet to the second exhaust component. The mixer includes a first housing portion with a first connection interface and a second housing portion with a second connection interface. The first housing portion is attached to the outlet of the first exhaust component and the second housing portion is attached to the inlet of the second exhaust component. The first and second connection interfaces are connectable to each other in one of a plurality of different connection orientations such that the first and second exhaust components can be positioned at any of a plurality of different mounting orientations relative to each other.

Abstract: An exhaust heat recovery device structure that includes: an exhaust heat recovery device main body that is disposed at an inner side of a floor tunnel formed at a vehicle transverse direction central portion of a floor panel, the exhaust heat recovery device main body carrying out heat exchange between cooling water and gas that is generated at an internal combustion engine of a vehicle; and a metal pipe that extends-out from the exhaust heat recovery device main body, the metal pipe being connected to one end of a resin hose whose another end is connected to the internal combustion engine, the connected portion that connects the metal pipe with the resin hose being provided to the metal pipe further toward a vehicle lower side than the exhaust heat recovery device main body, is provided.

Abstract: A method for regenerating an exhaust gas filter for vehicles includes controlling an engine to operate in a high RPM range by a controller and regenerating the exhaust gas filter, controlling the engine to operate in the high RPM range by a temperature sensor unit provided on an exhaust pipe, controlling the engine to operate in a middle RPM range above a measured exhaust gas temperature threshold, and controlling the engine to operate in the middle RPM range by the temperature sensor unit, and controlling the engine to operate in an idle state if the temperature of the exhaust gas measured by the temperature sensor unit in secondary measurement is a middle RPM escape temperature predetermined by the controller or lower.

Abstract: In a method of operating a drive device, a probe temperature of an exhaust gas exhaust gas probe in an exhaust tract is measured, as the exhaust gas probe is heated by a probe heater. A temperature growth value representative of an increase in temperature of the exhaust gas probe is determined during heating of the exhaust gas probe, and the presence of a defect of the probe heater is recognized, when the temperature growth value deviates from an input value.

Abstract: An exhaust tailpipe mounting system for mounting on an exhaust pipe end includes a tailpipe and a ring member attached to the tailpipe. At least three spring elements are attached to the ring member, wherein each spring element extends generally along a longitudinal axis and is bent into a wave shape. Each spring element has a proximal end opposite a distal end, where the proximal end is attached to the ring member and the distal end has at least one pointed end configured to grip into an outer surface of the exhaust pipe end. Each spring element has a first, second, third, fourth, fifth, sixth and seventh bend zone starting from the proximal end and respectively going to the distal end. The at least one pointed end of is angled at an angle of 75° to 85° in relation to the longitudinal axis of the spring elements.

Abstract: An exhaust system having a gasket includes a turbocharger disposed to be rotated by exhaust gas, a warming up catalytic converter through which exhaust gas discharged from the turbocharger passes and which purifies the exhaust gas, a connecting pipe disposed between the turbocharger and the warming up catalytic converter and which delivers the exhaust gas, a gasket interposed between an inlet side flange of the connecting pipe and an outlet side flange of the turbocharger, and which seals the exhaust gas, and a stay which connects the warming up catalytic converter to a vehicle body, and includes an elastically flexible curved line portion formed at one side of the stay.

Abstract: A cooling system includes a rear radiator that is mounted in a vehicle and circulates cooling water to release heat of the cooling water. A fan that generates cooling air to cool the rear radiator, and a shroud 50 is provided between the fan and the rear radiator and guides the cooling air. The shroud has a double structure having an internal space; the internal space enables the cooling water to pass through the internal space when the cooling water circulates.

Abstract: A controller-implemented method for controlling a fan drive of a machine having a transmission is provided. The controller-implemented method may include generating a default fan speed for controlling the fan drive based on one or more operating conditions associated with the machine, generating an override fan speed based on one or more operating conditions associated with the transmission, and controlling the fan drive according to the override fan speed at least partially during calibration of the transmission.

Abstract: An outdoor unit has a frame that carries a ground grooming or working implement, a traction drive, and a cooling fan, all of which comprises loads on a prime mover. A power management controller automatically reduces an operational speed of the traction drive when prime mover droop is present. The cooling fan cools two cooling fluids. The controller stores data representing variable fan speeds for cooling each cooling fluid in both normal and above normal temperature ranges and for use when prime mover droop is present. The controller uses the highest fan speed required for cooling the cooling fluids in the normal range unless the droop fan speed is lower in which case the lower droop fan speed is used but only to the extent that the lower droop fan speed is not lower than the highest fan speed required for cooling the cooling fluids in the above normal temperature range.

Abstract: A coolant control system of a vehicle includes a fraction module, and a coolant valve control module. The fraction module determines an oil fuel fraction based on an amount of fuel in an amount of engine oil. The coolant valve control module, based on the oil fuel fraction, selectively actuates a coolant valve to enable coolant flow from an integrated exhaust manifold (IEM) of an engine to an engine oil heat exchanger.

Abstract: An internal combustion engine for a motor vehicle drive includes a housing having a cylinder head water jacket, an exhaust water jacket and a combustion chamber water jacket. A valve is operable for adjusting a flow through a multi-channel coolant inlet. In particular, the valve provides continuous adjustment of a cross section, through which a fluid can flow of a multi-channel exhaust coolant outlet for admitting a flow to the exhaust water jacket and cross-section, through which a fluid can flow of a multi-channel combustion chamber coolant outlet for admitting a flow to the combustion chamber water jacket.

Abstract: Upon a valve rotation angle of a flow rate control valve exceeding a radiator-flow-path closed position during changing of the valve rotation angle of the flow rate control valve in an opening direction of a radiator flow path from a closed state of the radiator flow path, a cooling water starts to circulate through the radiator flow path, and an outlet water temperature or an inlet water temperature of an engine starts to drop. The radiator-flow-path closed position is learned as a valve rotation angle of the flow rate control valve immediately before the outlet water temperature or the inlet water temperature starts to drop during changing of the valve rotation angle of the flow rate control valve in the opening direction of the radiator flow path from the closed state of the radiator flow path.

Abstract: Methods of operation of liquid and gaseous multi-fuel compression ignition engines that may be operated on a gaseous fuel or a liquid fuel, or a combination of both a gaseous fuel and a liquid fuel at the same time and in some embodiments, in the same combustion event. Various embodiments are disclosed.

Abstract: An engine with mesh anchored combustion with a pressure regulating auxiliary chamber for providing controlled internal combustion at essentially a constant pressure. The engine comprises a main cylinder and piston with an auxiliary chamber and piston integral therewith. The auxiliary chamber is adjacent to the main cylinder head, connected thereto through a relatively narrow throat. A mesh is positioned in the throat at the boundary of the main cylinder and the auxiliary chamber. Accordingly, when the main piston compresses a charge in the main cylinder during its compression stroke, the charge is pushed through the mesh into the auxiliary chamber. The auxiliary chamber piston pushes the charge in the reverse direction back through the mesh into the main cylinder. As the charge passes through the mesh back into the main chamber, its combustion forces the main piston back down toward bottom dead center.

Abstract: Provided is an engine with a two-stage supercharger whereby an increase in required space for installing an engine can be suppressed without impairing cooling performance of an intercooler. This engine (1) has a first compressor unit (8) and second compressor unit (12) disposed in an air intake device (2) forming an intake air passage, and this engine (1) is configured such that intake air pressurized by the first compressor unit (8) is cooled by an intercooler (14) and supplied to the second compressor unit (12), and the intake air pressurized by the second compressor unit (12) is cooled by the intercooler (14).

Abstract: An intake system of an engine having an intake duct includes an intake line disposed to transmit a gas including ambient air to a combustion chamber of an engine. An intake duct formed in a preset section of the intake line and configured to transmit the gas to the combustion chamber. The intake duct is formed of metal, and a coolant jacket formed in a preset region of an outer surface of the intake duct and disposed to cool a gas flowing in the intake duct. A coolant inlet for supplying a coolant is formed at one side of the coolant jacket and a coolant outlet for discharging the coolant is formed at another side of the coolant jacket.

Abstract: An intercooler may include an air-outlet tank, a condensate collector for collecting condensate separated off the intercooler, and a condensate line connected to the condensate collector via an entrance and that opens out into the air-outlet tank via an exit. There may be a pressure difference between the entrance and the exit of the condensate line during operation of the intercooler, and said pressure difference may allow differential-pressure-induced discharge of condensate from the condensate collector via the condensate line.

Abstract: Turbine assemblies and related turbocharger systems having direct turbine interfaces are provided. One exemplary turbine assembly includes a first turbine housing having an outlet portion defining a fluid outlet of a first turbine and a second turbine housing having an inlet portion defining a fluid inlet of a second turbine, wherein at least a portion of the inlet portion radially surrounds at least a portion of the outlet portion to provide a direct interface from the fluid outlet of the first turbine to the fluid inlet of the second turbine in an axial direction.

Abstract: Methods and systems for adjusting a branch communication valve in a dual scroll turbocharger system are provided. In one example, a method may include adjusting a position of a valve arranged between a first adaptor and a second adaptor to enable mixing of exhaust received from an exhaust manifold, the exhaust delivered to a first scroll and a second scroll of a turbocharger to drive a turbine during certain engine operating conditions.

Abstract: An engine system for controlling flow of exhaust gas may include an intake line to receive external air, an engine including a combustion chamber to combust the external air and a fuel supplied through the intake line, to generate driving torque, an exhaust line to exhaust the exhaust gas combusted in the combustion chamber of the engine, a turbocharger including a turbine operated according to exhaust gas flowing through the exhaust line and a compressor to compress the external air flowing through the intake line, a catalyst device to reduce a harmful component included in the exhaust gas passing through the turbine of the turbocharger, a bypass line branched from the exhaust line between the combustion chamber and the turbine and converged in the intake line between the compressor and the combustion chamber, and a bypass valve disposed in the bypass line to selectively open/close the bypass line.

Abstract: A valve device of a turbocharger includes: a valve seat disposed on an entrance of a fluid passage divided into at least two branches, and an opening/closing valve coupled to a rotary shaft rotatably disposed adjacent to the valve seat. The valve seat has a contact surface which is flat and a dividing section which extends across the entrance and divides the entrance into two entrance sections. The opening/closing valve closes the entrance of the fluid passage disposed in the valve seat. The bottom surface of the opening/closing valve is in surface contact with the contact surface of the valve seat. The central portion of the opening/closing valve corresponding to the dividing section is spaced apart from the dividing section at a predetermined distance.

Abstract: An object is to provide a structure and a method of joining a nozzle vane and a lever, and a variable geometry turbocharger, capable of reducing breakage of a welded part between a shaft portion of the nozzle vane and the lever during usage of the same by reducing generation of a hot crack in weld metal at the welded part. A joint structure includes: a nozzle vane 2 disposed in an exhaust passage for guiding exhaust gas to a turbine wheel 34 of a variable geometry turbocharger 500, and including a shaft portion 2a; and a lever 1 including a fitting surface 42a fitted with a peripheral surface 72 on one end side of the shaft portion, for transmitting torque to the shaft portion to adjust a vane angle of the nozzle vane. Weld metal 50 at a welded part 40 between the lever and the nozzle vane is formed so that a center position 64 of the weld metal is disposed inside a position 17 of the fitting surface with respect to a radial direction of the shaft portion.

Abstract: A control apparatus of an engine including a cylinder into which a piston is reciprocatably fitted is provided. The apparatus includes a fuel injector for injecting fuel into the cylinder, a water injector for injecting supercritical or subcritical water into the cylinder, and a controller. The controller includes an operating range determining module for receiving a parameter and determining whether an engine operating range is within a water injection range. Within the water injection range, the controller controls the fuel injector to inject a portion of the fuel on an intake stroke or in an early half of compression stroke, and the water injector to inject the water toward a piston crown surface in a period that is between a latter half of the compression stroke and an early half of expansion stroke, after the fuel injection, and before a mixture gas is ignited inside the cylinder.

Abstract: A rotating piston internal combustion engine including a housing which includes a housing wall that forms an operating chamber, and in which housing a rotatable rotating piston is arranged which extends through the operating chamber and moves edges of the rotating piston along the housing wall that forms a running surface, wherein a portion of the operating chamber functions as a combustion chamber together with an associated combustion chamber wall for igniting a fuel that is arranged in the operating chamber, characterized in that at least one microwave window is arranged in the combustion chamber wall, wherein a device for injecting microwave energy in a form of microwaves into the combustion chamber of the operating chamber is arranged at a side of the microwave window that is oriented away from the combustion chamber.

Abstract: A customizable portable generator system and methods for assembling the same are disclosed. In one example, the generator system generally includes a universal frame including a plurality of mounting interfaces configured for detachably attaching one of a plurality of different engines and a plurality of wheel assemblies and/or support legs. Optionally, at least one handlebar assembly may be detachably mounted on the frame in at least one of two possible positions. In one example, the handlebar may be pivotably mounted to the frame. The frame components may be assembled into a kit from which a user may select various options to custom configure the generator unit. Other appurtenances and accessories may be provided which interface with the generator unit and frame. A modular generator frame and compressed gas-fueled generators are also disclosed.

Abstract: A hydraulic valve, in particular for shifting an actuation piston in a piston rod for an internal combustion engine with variable compression, the piston rod including a valve housing which includes a first operating connection and a second operating connection and a supply connection which is loadable with a hydraulic pressure of a hydraulic fluid, wherein a piston that is movably arranged in the valve housing is movable in a linear manner against a force of a preloaded spring, wherein the operating connections and the supply connection are sealable relative to each other and against an ambient atmosphere by seal elements upon correct installation in a valve receiving bore hole of the connecting rod, and wherein the seal elements are applicable against a wall of the valve receiving bore hole in a sealing manner due to the hydraulic pressure.

Abstract: A ballistic cover system that embodies a novel ballistic blanket and method for containing energy and fragmentation projected during a supercharged engine explosion is provided. The ballistic cover system enables the ballistic blanket to react to the engine explosion, positioning itself from a racing configuration to a ballistic configuration. A plurality of restraint straps are attached to the supercharger, keeping it along a controlled path during the explosion. Moreover, two of the restraint straps act as mounting rails that the ballistic blanket rides along when reactively moving from the racing configuration to the ballistic configuration.

Abstract: A method and installation for storing and recovering energy, according to which a condensed air product is formed in an energy storage period, and in an energy recovery period, a pressure flow is formed and is expanded to produce energy using at least part of the condensed air product. For the formation of the condensed air product: the compression of air in an air conditioning unit, at least by means of at least one isothermally operated compressor device and the adsorptive cleaning of the air by means of at least one adsorptive cleaning device at a hyperbaric pressure level.

Abstract: A system and related method for providing a highly reactive fuel to a combustor of a gas turbine are disclosed herein. The system includes a fuel supply system that is in fluid communication with a fuel supply. The fuel supply system includes multiple fuel circuits. Each fuel circuit individually feeds fuel to a corresponding fuel distribution manifold. The system further includes a steam injection system. The steam injection system includes at least one flow control valve that is in fluid communication with at least one of the fuel circuits. The flow control valve provides for fluid communication between a superheated steam source and the fuel circuit during both fueled operation and during non-fueled operation of the corresponding fuel circuit.

Abstract: A gas turbine engine assembly for an aircraft includes a fan section delivering air into a main compressor section. The main compressor section includes a first compressor section and a second compressor section operating at a higher pressure than the first compressor section. The main compressor section compresses air and delivers air into a combustion section where the air is mixed with fuel and ignited to generate products of combustion that are passed over a turbine section to drive the fan section and main compressor sections. An environmental control system includes a low pressure tap at a location on the first compressor section of the main compressor section. The low pressure tap communicates airflow to a first passage leading to a downstream outlet. A compressor is driven by an electric motor. A combined outlet intermixes airflow from the first passage and from the compressor driven by the electric motor and passes the airflow downstream to be delivered to an aircraft use.

Abstract: A gas turbine engine including a compressor section, a turbine section, and a combustion section positioned between the compressor section and the turbine section is provided. The gas turbine engine also includes a cooling system having a tank and one or more fluid lines in fluid communication with the tank. The one or more fluid lines are configured to carry a flow of consumable cooling liquid provide such consumable cooling liquid to one or more components of the compressor section, the turbine section, and/or the combustion section not directly exposed to a core air flowpath defined through the gas turbine engine.

Abstract: A gas turbine engine with an air cooled turbine component in which spent cooling air from the turbine component is routed through a rotor disk and into a static vaned diffuser on a static part of the engine so that the spent cooling air can be discharged into the combustor instead of into the turbine hot gas stream. The static vaned diffuser includes de-swirling vanes that de-swirl the flow coming off of the rotor and then diffuses the de-swirled air to increase a pressure for discharge into the combustor.

Abstract: A system including a fuel-supply system including, an auxiliary-fuel-gas compressor configured to compress a fuel for use by a gas-turbine system, an expander configured to generate power by expanding an oxidant from the gas-turbine system, and a motor/generator configured to function in a motor mode and in a generator mode, wherein the motor/generator drives fuel compression with the auxiliary fuel-gas compressor in the motor mode, and the motor/generator generates power in the generator mode as the expander uses oxidant from the gas-turbine system to drive the motor/generator

Abstract: An aircraft engine sound attenuation apparatus includes a perforated face member, a backing member, a plurality of connecting members coupling the perforated face member to the backing member to form a plurality of channels spanning from the perforated face member to the backing member, and a bulk absorber disposed in each of the plurality of channels, wherein the plurality of channels are connected to an interior portion of an aircraft engine nacelle component so that the plurality of channels are oriented in a direction substantially normal to a direction of fluid flow pressure drop passing through the aircraft engine.

Abstract: An aircraft auxiliary power unit sound attenuation apparatus includes a perforated body having a center aperture through which exhaust fluid passes, a backing member outwardly offset from the perforated body, a plurality of connecting members coupling the perforated body to the backing member to form a locally reacting sound attenuation member having a plurality of channels spanning outwardly from the perforated body to the backing member, and a bulk absorber disposed in each of the plurality of channels where the bulk absorber is in fluid communication with the exhaust fluid, where the locally reacting sound attenuation member is in fluid communication with an auxiliary power unit of an aircraft so that the plurality of channels are oriented in a direction crossing a pressure drop direction of an exhaust fluid flow passing through the center aperture and each channel circumscribes the center aperture.

Abstract: An industrial gas turbine engine with a high spool and a low spool in which low pressure compressed air is supplied to the high pressure compressor, and where a portion of the low pressure compressed air is bled off for use as cooling air for hot parts in the high pressure turbine of the engine. Annular bleed off channels are located in the LPC diffuser. The bleed channels bleed off around 15% of the core flow and pass the bleed off air into a cooling flow channel that then flows into the cooling circuits in the turbine hot parts.