Abstract: A split control unit in a distributed flow unit includes a flow inlet configured to receive a fuel flow, a first manifold having flow lines to supply fuel to one or more primary nozzles, and a second manifold having flow lines to supply fuel to one or more secondary nozzles. In an embodiment, the second manifold is in fluid communication with the flow inlet. A metering valve has a first port in fluid communication with the flow inlet and with the second manifold. The metering valve is configured to supply a metered fuel flow to the first manifold. A flow passage is in fluid communication with, and runs between, a flow line of the first manifold and a flow line of the second manifold to allow for a continuous cooling flow in the second manifold when all of the one or more secondary nozzles are closed.

Abstract: An internally coolable component for a gas turbine with at least one cooling duct, on the inner surface of which swirl elements are arranged in the form of turbulators which extend transversely with respect to the main flow direction of a coolant is provided. In order to reduce pressure losses for the coolant in the cooling duct, pins with different heights are set up between the turbulators.

Abstract: A mid-span shroud assembly for a turbine blade airfoil includes a pressure side shroud body which is associated with a pressure side wall of the airfoil and a suction side shroud body which is associated with a suction side wall of the airfoil. At least one of the pressure side shroud body and the suction side shroud body defines a coupling spar which is formed to extend at least partially through a bore hole defined within the airfoil of the turbine blade.

Abstract: An object of the present invention is to provide a Ni-based superalloy, especially for a conventional casting, having a good balance among high temperature strength, corrosion resistance and oxidation resistance, as compared to a conventional material. The Ni-based superalloy comprises Cr, Co, Al, Ti, Ta, W, Mo, Nb, C, B, and inevitable impurities, the balance being Ni, the Ni-based superalloy having a superalloy composition comprising, by mass, 13.1 to 16.0% Cr, 11.1 to 20.0% Co, 2.30 to 3.30% Al, 4.55 to 6.00% Ti, 2.50 to 3.50% Ta, 4.00 to 5.50% W, 0.10 to 1.20% Mo, 0.10 to 0.90% Nb, 0.05 to 0.20% C, and 0.005 to 0.02% B.

Abstract: A turbomachine has an annular main flow duct through which passes a flow, and in which is arranged at least one stator provided with stator vanes. The stator vanes each have at least one recess issuing into a flow duct inside the stator vanes and the flow duct issues into a bypass duct of the turbomachine via at least one outflow duct provided with a shut-off element.

Abstract: A steam turbine is provided. The steam turbine includes a housing and a steam inlet configured to discharge a primary steam flow within the housing. A stator is coupled to the housing and a rotor is coupled to the housing and located within the stator. The rotor and the stator are configured to define a primary flow path there between and in flow communication with the primary steam flow. The steam turbine includes a seal assembly coupled to the housing. The seal assembly includes a packing head and a plurality of seals. The packing head is configured to define a cooling flow path in flow communication with the rotor and configured to discharge a cooling steam flow toward the rotor. An anti-swirl device is coupled to the seal assembly and located between the rotor and the packing head.

Abstract: The invention relates to a full arc admission steam turbine, which includes a plurality of nozzle boxes for inducing steam, and a plurality of nozzle plates for bearing nozzles, one nozzle plate corresponding to each nozzle box. The steam turbine 100 further includes a plurality of spacer plates corresponding to the plurality of nozzle boxes, wherein the spacer plate is disposed between the nozzle plate and the nozzle box, by which a flow path is formed between the plurality of nozzle boxes and the plurality of the nozzle plates through the plurality of spacer plates to achieve a full arc admission. With the solution according to embodiments of the present invention, existing partial arc steam turbine may be easily converted to be a full arc admission steam turbine. This will reduce cost of equipment upgrading. Outage due to onsite conversion may be significantly reduced.

Abstract: A blade outer air seal (BOAS) for a gas turbine engine according to an exemplary aspect of the present disclosure includes, among other things, a seal body having a radially inner face and a radially outer face that axially extend between a leading edge portion and a trailing edge portion. At least one cooling fin is disposed on the radially outer face between the leading edge portion and the trailing edge portion.

Abstract: A turbocharger includes an open-and-close mechanism which opens and closes a circulation hole through which an exhaust gas flows into a turbine housing or the exhaust gas flows out of the turbine housing. The open-and-close mechanism includes: a valve; and an attachment plate one end of which is fixed to the valve, and the other end of which is provided with an insertion hole through which a stem turnably supported by the turbine housing is inserted, and an exposure hole which communicates with the insertion hole to expose part of an outer peripheral surface of the stem. The diameter of the insertion hole is gradually smaller in a direction of insertion of the stem. The stem includes a tapered portion whose diameter is gradually smaller toward its tip end in the direction of insertion into the insertion hole.

Abstract: Method and blade monitoring system for monitoring bending moment of a wind turbine blade. The method comprises obtaining a first sensor set signal indicative of a first bending moment at a first sensor position different from the tip end along the longitudinal axis of the wind turbine blade, and estimating a bending moment at a first estimation position along the longitudinal axis based on the first sensor set signal, wherein the first sensor position is different from the first estimation position along the longitudinal axis. The blade monitoring system comprises a processing unit and an interface connected to the processing unit, the processing unit being configured for performing the method.

Abstract: A thrust bearing for a turbocharger includes a bearing body having a bearing surface extending parallel to a collar of a rotating shaft. The bearing body defines a central bore through which the rotating shaft extends. The thrust bearing includes tapered lands formed in the bearing surface at spaced arcuate locations extending radially outward of the second bore. Each tapered land includes a first ramp extending from within the bearing body to the bearing surface along a gradient, a flat extending from the first ramp along the bearing surface, and a second ramp extending from the flat into the bearing body along the gradient. Rotation of the shaft and the collar in either direction equally pressurizes a working fluid between the collar and the bearing surface.

Abstract: A gas turbine engine includes a fan, a compressor section, a combustor, and a turbine section. The engine also includes a rotating element and at least one bearing compartment including a bearing for supporting the rotating element, a seal for resisting leakage of lubricant outwardly of the bearing compartment and for allowing pressurized air to flow from a chamber adjacent the seal into the bearing compartment. A method and section for a gas turbine engine are also disclosed.

Abstract: A support arrangement (10) for a transition piece (12) of a gas turbine engine (14). The support arrangement includes a mounting bracket (16) for the transition piece and a pin (18) supporting the mounting bracket in an interior (20) of the gas turbine engine and extending through an opening (22) in a casing (24) to an exterior (26) of the gas turbine engine. The support arrangement further includes a spherical washer (28, 38) positioned between the pin and either the mounting bracket or the casing.

Abstract: A method of controlling a thermal power plant for electricity generation, said power plant comprising at least one heat source to supply thermal energy to a working fluid circulation circuit. The circuit comprises a high pressure turbine mechanically connected to an electricity generator, a high pressure regulating valve controlling the steam supply to said high pressure turbine from a high pressure superheater associated with a high pressure storage tank. The fluid supply to said high pressure storage tank from a high pressure steam generator is controlled by a high pressure supply valve, and, in response to a need for additional electrical power, the opening of the high pressure regulating valve is increased the opening of the high pressure supply valve is reduced.

Abstract: The invention relates to a method for operating a power plant, wherein in partial load operation the increase of temperature results at the outlet of the high-pressure turbine section as a consequence of a throttling by means of the intermediate pressure valve.

Abstract: A switchable finger follower having at least two lift modes includes a primary lever and a secondary lever mounted for pivoting movement to the primary lever, the secondary lever includes a cam contact surface, and a lost motion contact projection. A coupling device on the primary lever includes a coupling pin that moves between a locking position, in which the secondary lever is locked to the primary lever in a lift position, and an unlocked position, in which the secondary lever is pivotable relative to the primary lever. A first lost motion idler arm is pivotally connected to the primary lever and has a distal end that contacts the lost motion contact projection. A first lost motion spring is located between the primary lever and the first lost motion idler arm that maintains a preload on the secondary lever via the first lost motion idler arm in the unlocked position.

Abstract: The present invention relates to a camshaft (1) for an internal combustion engine with a drive wheel (4) arranged on a longitudinal end side, in particular with a chain wheel or belt pulley, and with at least one first bearing (2) arranged in the region of the drive wheel (4) and a second bearing (3) arranged in the further course of the camshaft (1). Here it is substantial to the invention that at least the first bearing (2) is designed as a rolling bearing and has an inner diameter of 24 mm<di<30 mm, wherein the inner diameter di is larger than the outer diameter da of the camshaft (1) on the second bearing (3). Because of this, the camshaft (1) can be configured more compact and lighter.

Abstract: A cam element portions is configured such that respective maximum lift portions (lift ending points) of both-side end-face cams thereof are provided at respective phases which are different from each other in a rotational direction and that a maximum value of a length, in an axial direction, between respective cam faces of the both-side end-face cams which are provided at the same phase is set to be a distance, in the axial direction, between a first operational member and a second operational member or smaller. Accordingly, in a valve gear of an engine in which cams operative to control opening/closing of a valve are switchable, it can be properly prevented that a camshaft locks and stop rotating because of an operational malfunction of an operational member or the like.

Abstract: A camshaft phaser, including: a stator arranged to receive torque; a rotor arranged to be non-rotatably connected to a camshaft; first and second wedge plates radially disposed between the rotor and the stator; and a displacement assembly arranged to for an advance mode, displace the first wedge plate in a first axial direction so that the rotor is rotatable with respect to the stator in a first circumferential direction. For a retard mode, the displacement assembly is arranged to displace the second wedge plate in a second axial direction, opposite first axial direction, so that the rotor is rotatable with respect to the stator in a second circumferential direction, opposite the first circumferential direction.

Abstract: A continuous variable valve duration apparatus may include a cam rotatably mounted on a cam carrier, a camshaft disposed within the cam and relatively rotatable with respect to the cam, in which a rotation center of the camshaft is variable with respect to a rotation center of the cam, a connecting link disposed between the cam and the camshaft, in which the connecting link is pivotally connected to at least one of the cam and the camshaft, and transmits rotation of the camshaft to the cam, and a control portion selectively changing the rotation center of the camshaft.

Abstract: A control method and apparatus for a variable engine valve operating control mechanisms which move the engine valves to a safe lift/timing position with respect to a piston to minimize the potential for valve to piston contact during valve surge. At least one engine operating conditions is selected and provided with a threshold triggering a control to move the valves to a safe position in a calibrated, predictive manner in advance of any potential valve to piston contact. The control method and apparatus can be integrated into the existing engine control and variable valve operating control mechanism.

Abstract: A method and system is provided for regenerating and cleaning an air-oil coalescer of a crankcase ventilation system of an internal combustion engine generating blowby gas in a crankcase. The coalescer coalesces oil from the blowby gas. The method and system includes regenerating and cleaning the coalescer by intermittent rotation thereof.

Abstract: An inertial gas-liquid impactor separator includes flow director guidance structure directing and guiding flow through the housing from the inlet to the outlet along a flow path from upstream to downstream. The flow director guidance structure may include a flow controller controlling and directing flow.

Abstract: An exhaust muffler has downstream and upstream chambers which are defined in a casing. Exhaust gas from an internal combustion engine is introduced into an end of a first conduit having a pierced region which is held in fluid communication with the downstream chamber and an end of a second conduit. The other ends of the first and second conduits are open into the upstream chamber. A valve means configured to open/close the first and second conduits is actuated by valve actuating means to switch between a short channel mode discharging the exhaust gas from at least the first conduit through the pierced region, the downstream chamber, and a discharge pipe out of the casing and a long channel mode discharging the exhaust gas from at least the second conduit through the upstream chamber, the pierced region, the downstream chamber, and the discharge pipe out of the casing.

Abstract: A vehicle includes an engine configured to generate power and noise. The vehicle includes a transmission configured to operate in a first gear corresponding to a first gear ratio and a second gear corresponding to a second gear ratio. The second gear ratio is less than the first gear ratio. The vehicle also includes a noise reduction device coupled to the engine and configured to operate in a first state to reduce the noise of the engine to a first volume and a second state to reduce the noise of the engine to a second volume that is greater than the first volume. The vehicle also includes an electronic control unit (ECU) coupled to the engine, the transmission and the noise reduction device and configured to control the noise reduction device to switch to the second state when the transmission shifts from the second gear to the first gear.

Abstract: There is provided a honeycomb structure where a crack at honeycomb segments, which constitute a honeycomb bonded assembly, is reduced. A honeycomb structure has a pillar-shaped honeycomb bonded assembly that has a plurality of pillar-shaped honeycomb segments having a porous partition wall defining a plurality of cells extending from an inflow end face as one end face to an outflow end face as another end face and becoming channels for a fluid, and a bonding layer bonding side surfaces of the plurality of honeycomb segments, and in the honeycomb bonded assembly, at 25 to 800° C., a thermal expansion coefficient of the bonding layer is larger than a thermal expansion coefficient of the honeycomb segment.

Abstract: A diesel engine aftertreatment system comprises a diesel engine having an exhaust manifold and a filter substrate in direct connection with the exhaust manifold without any intervening catalyst, wherein the filter substrate comprises on its inlet side an SCR catalyst incorporating a non-coking molecular sieve.

Abstract: A method of regenerating an oxidation device (3) of an internal combustion engine (1), in particular a stationary internal combustion engine, wherein the oxidation device (3) is connected downstream of the internal combustion engine (1) and wherein a mixture of combustion gas and exhaust gas can be fed to the oxidation device (3) to increase a temperature in the oxidation device (3) and wherein exhaust gas can be passed around the oxidation device (3) by way of a bypass conduit (4), wherein the amount of exhaust gas passed around the oxidation device (3) by way of the bypass conduit (4) is controlled in open-loop or closed-loop control mode in dependence on an ascertained exhaust gas temperature downstream of the oxidation device (3).

Abstract: This disclosure relates generally to vehicles with reduced emissions. More particularly, this disclosure relates to systems, methods, and apparatuses related to vehicles with reduced carbon dioxide emissions. The carbon dioxide emissions may be stored in a carbon dioxide clathrate.

Abstract: A method for operating a reagent metering system which meters a reagent into an exhaust duct of an internal combustion engine upstream of an SCR catalytic converter, in which, after the metering operation is ended, at least part of the reagent metering system is emptied by back-suction by means of a reciprocating pump. The procedure according to the invention is distinguished in that during the back-suction, a stop determination determines the flight time of a reciprocating piston of the reciprocating pump from a starting time as far as the stop time, in that a comparator compares the flight time determined with a flight time threshold value, and in that the activation power of the reciprocating pump is reduced if the flight time determined is less than the flight time threshold value.

Abstract: The invention relates to an exhaust gas after-treatment device and a method, having a storage container and a buffer reservoir, both of which can be heated. In this manner it is possible to significantly reduce the energy requirement for providing gaseous ammonia for an exhaust gas after-treatment device of an internal combustion engine.

Abstract: A method for loading or reloading a decomposition unit of a vehicular system, the vehicular system including a filler pipe in communication with the decomposition unit. The method includes introducing at least one capsule including at least one protein component adapted to decompose ammonia precursor through the filler pipe and which is then guided through the filler pipe towards the decomposition unit.

Abstract: A diagnostic apparatus for an exhaust gas purification apparatus including a selective catalytic reduction NOx catalyst (SCR catalyst) provided in an exhaust passage of an internal combustion engine, a supplying unit supplying ammonia or an ammonia precursor into exhaust gas flowing into the SCR catalyst and a sensor, provided on a downstream side of the SCR catalyst, detecting NOx and ammonia in exhaust gas. The diagnostic apparatus calculates an amount of decline in output of the sensor due to a reaction between NOx and ammonia at the sensor and performs a diagnosis of the supplying unit based on the calculated amount of decline in output of the sensor.

Abstract: A heat exchanger (7) for an exhaust gas system (5) of an internal combustion engine (1) includes a thermoelectric generator (13) with plural thermoelectric elements (15) that each have a hot side (16) and a cold side (17). A heating channel (18) conducts a heating medium on the hot sides and a cooling channel (19) conducts cooling medium on the cold sides (17). The thermoelectric generator (13), the heating channel (18), and the cooling channel (19) are arranged adjacent in a stacking direction (20) and form a channel stack (21). A housing (8) that encloses an interior (22) accommodates the channel stack (21) and has medium inlets (9, 11), outlets (10, 12) and electrical connections (14). The thermoelectric elements are arranged in a double-walled intermediate bottom (15) that separates the cooling channel (19) from the heating channel (18), adjacent to said cooling channel, in regard to fluid flow.

Abstract: A method of operating components for exhaust gas after-treatment disposed in the exhaust gas tract of a turbocharged internal combustion engine. A partial exhaust gas stream is removed from the main exhaust gas stream upstream of at least one exhaust gas turbine. The partial exhaust gas stream is fed back into the main exhaust gas stream downstream of the at least one exhaust gas turbine. The feed is located, in terms of exhaust flow, between an NO oxidation catalytic converter and a particle filter (i.e., the exhaust gas after-treatment component). That is, the at least one exhaust gas after-treatment component is arranged downstream of the feed. The quantity of exhaust gas branched off as a partial exhaust gas stream is controlled or closed-loop controlled as a function of at least one target temperature in at least one defined point in the exhaust gas tract, in particular in the partial exhaust gas stream and/or of the at least one exhaust gas after-treatment component.

Abstract: An engine control system includes an injection determination module, a correction factor determination module, and a regeneration control module. The injection determination module determines a desired amount of hydrocarbons (HC) to inject into exhaust gas produced by an engine based a flow rate of the exhaust gas. The correction factor determination module determines a correction factor for the desired amount of HC based on engine speed and engine load. The regeneration control module controls injection of an adjusted amount of HC into the exhaust gas during regeneration of a particulate matter filter, wherein the adjusted amount of HC is based on the desired amount of HC and the correction factor.

Abstract: A method is disclosed for controlling a diesel engine equipped with a diesel particulate filter (DPF). The method includes detecting steady state operation of the engine generating a first flow rate of particulate matter (PM) directed into the DPF. The method also includes, during the steady state operation, triggering exhaust gas recirculation to the engine and thereby directing a second PM flow rate that is greater than the first flow rate into the DPF. The method additionally includes detecting a PM flow rate exiting the DPF in response to the second PM flow rate directed into the DPF. The method also includes comparing the detected PM flow rate exiting the DPF with a PM flow rate threshold. Furthermore, the method includes regulating injection of fuel to regenerate the DPF, if the detected PM flow rate exiting the DPF is greater than the PM flow rate threshold.

Abstract: A mechanical coolant pump for an internal combustion engine includes an impeller pump wheel. The pump housing comprises an outlet valve arrangement arranged between an outlet volute and a pump outlet, and a support portion. The pump housing closes and/or opens a valve opening. The outlet valve arrangement comprises a valve body which pivots. The valve body comprises a closing element which covers the valve opening, and first and second end disks. The closing element comprises an opening seat in a closed valve position. The first and second end disks are parallel to each other, are arranged at opposite axial ends of, and perpendicular to, the closing element, and rotate around a pivot axis. The first and second end disks each comprise a radial clamping nose which acts with the support portion to radially push the closing element against the opening seat in a closed valve position.

Abstract: A control method of an electrical thermostat that includes an operating heater heating wax so as to operate an operating valve that may be disposed to close a coolant passage according to an exemplary embodiment of may include detecting a coolant temperature of coolant circulating a coolant passage, determining whether the coolant temperature may be included in a predetermined heating temperature range, performing a coolant heating mode by supplying a predetermined level of power to the operating heater for a predetermined time, if the coolant temperature may be within the heating temperature range, and stopping the coolant heating mode in a condition that the operating valve may be closed.

Abstract: The invention relates to a method for operating at least one precombustion chamber-fired internal combustion engine, in particular a stationary gas Otto cycle engine, having a pilot chamber and a main combustion chamber associated with the precombustion chamber, wherein a gas mixture is fed to the precombustion chamber as flushing gas, wherein a synthesis gas generated in a fuel reformer and a fuel from a fuel source are fed to the flushing gas and wherein a fuel and at least one further substance stream are fed to the fuel reformer for the reforming process, wherein at least one operating parameter of the at least one internal combustion engine is monitored, wherein in accordance with a change in the at least one operating parameter the chemical composition of the flushing gas is modified by changing the mass stream of the at least one further substance stream.

Abstract: Output performance of the engine may be maximized by a configuration in which air is supplied so as to maximize volumetric efficiency of the respective cylinders in a multi-cylinder engine including a plurality of cylinders.

Abstract: A turbocharger control system for an internal combustion engine having first and second turbochargers connected in series includes first and second pressure sensors, and a controller. The first and second pressure sensors are disposed in an air intake of the engine, and are configured to sense boost pressure of the first and second turbochargers, respectively. The controller is configured to receive pressure signals from the first and second pressure sensors, and to control operation of at least one of the first and second turbochargers to maintain a desired boost pressure ratio.

Abstract: A turbocharged internal combustion engine system includes at least one high pressure turbocharger and at least one low pressure turbocharger arranged in series. A fuel source that provides fuel for gaseous fuel induction operation of the engine is connected to inject fuel between the low pressure compressor of the low pressure turbocharger and the high pressure compressor of the high pressure turbocharger.

Abstract: A single-shaft dual expansion internal combustion engine includes first and second power cylinders and an expander cylinder. The cylinder head fluidly couples the first and second power cylinders and the expander cylinder. First and second power pistons reciprocate in the first and second power cylinders and connect to a first crankpin of the crankshaft. A multi-link connecting rod assembly includes a rigid main arm supporting a first pivot pin, a second pivot pin and a third pivot pin. The first pivot pin connects to an expander piston reciprocating in the third cylinder. The third pivot pin couples to a first end of a swing arm, and a second end of the swing arm rotatably couples to a fourth pivot pin that couples to a distal end of a rotating arm that attaches to a rotating shaft coupled to rotation of the crankshaft.

Abstract: A portable on-demand hydrogen supplemental system is provided for producing hydrogen gas and injecting the hydrogen gas into the air intake of internal combustion engines for the purpose of increasing the combustion efficiency in the combustion chamber and lowering particulate emissions at idle. Hydrogen increases the laminar flame speed of diesel fuels, thus increasing combustion efficiency. Hydrogen and oxygen is produced by an electrolyzer from nonelectrolyte water in a nonelectrolyte water tank. The hydrogen gas is passed through a hydrogen gas collector. Nonelectrolyte water mixed with the hydrogen gas in the hydrogen gas collector is passed back thru the tank for distribution and water preservation. The system utilizes an an onboard diagnostic (OBD) interface in communication with the vehicle's OBD terminal, to regulate power to the system so that hydrogen production for the engine is adjusted based on the RPM level and operation conditions of the vehicle.

Abstract: An electricity-generating system of the invention which includes the following: a carbonization apparatus for carbonizing a carbonization source to form a carbonized product; a heat recovery steam generator for producing first steam through heat exchange with the heat exhausted from the carbonization apparatus; a carbonized fuel steam generator which employs the carbonized product serving as a fuel; a mixing header for mixing the first steam and a second steam produced by the carbonized fuel steam generator, which steams are fed thereinto, to thereby discharge a steam mixture having a uniform pressure; an electricity-generating apparatus for generating electricity by means of the steam mixture discharged from the mixing header as an actuating source; and an electricity-storing apparatus for storing the electricity generated by the electricity-generating apparatus.

Abstract: The present invention relates to a fuel injector configuration that treats a dielectric fluid such as gasoline fuel with strong electric and, optionally, magnetic fields to form a homogeneous charged fuel or fuel/air mixture for combustion in an internal combustion engine. The electric field is supplied by a triboelectric dipole and the magnetic field is supplied by permanent magnets. Small charged fuel particles are produced and combust more readily than untreated particles. Fuel efficiency is increased and emissions are reduced.

Abstract: A variable compression ratio device for an internal combustion engine includes: a connecting rod, having a small end and a large end, wherein a support hole formed at the small end is pivotally supported by a support shaft of a piston that reciprocates in a cylinder, and a support hole formed at the large end is pivotally supported by a support shaft of a crankshaft; an eccentric sleeve that is rotatably installed between the support hole of the small end or the support hole of the large end and the support shaft, and displaces a center axis of the support hole of the small end or a center axis of the support hole of the large end with respect to a center axis the support shaft; and an actuator that drives and rotates the eccentric sleeve.

Abstract: A system includes a turbine combustor that includes a head end portion having a head end chamber, a combustion portion having a combustion chamber disposed downstream from the head end chamber, a cap disposed between the head end chamber and the combustion chamber, and a flow separator configured to separate a first exhaust flow from an oxidant flow. The flow separator is configured to direct the first exhaust flow into the head end chamber. The turbine combustor also includes a mixing region configured to mix the first exhaust flow with the oxidant flow to provide an oxidant-exhaust mixture.

Abstract: One example of an engine mounted inlet plenum for a rotorcraft includes an inlet flange, an outlet flange and a plenum duct that connects the inlet flange and the outlet flange. The inlet flange, which defines an inlet to flow air into a barrier filtration system, is configured to be substantially aligned with a closed cowl door assembly of the rotorcraft. In some implementations, the plenum duct is configured to extend to an outer mold line (OML) of the rotorcraft such that the inlet flange is aligned with the OML. The outlet flange defines an outlet to flow air filtered by the barrier filtration system into an engine of the rotorcraft. The plenum duct allows air to flow from the inlet to the outlet.