Abstract: Disclosed herein is a method and an exhausting apparatus for an internal combustion engine including: a central exhaust passage; a first expansion chamber in an upstream portion of the exhaust system and in fluidic communication with the central exhaust passage; a second expansion chamber in a downstream portion of the exhaust system and in fluidic communication with the central exhaust passage and the first expansion chamber, forming a continuous expansion chamber throughout a length of the exhausting apparatus.

Abstract: A work vehicle includes: a top having a first hole; a plate having a second hole and attached to the top with the second hole in alignment with the first hole; an exhaust pipe having an internal path and a flange projecting outward and abutting against and thus attached to the plate; and a tail pipe having a portion positioned in the first and second holes, and an end in the internal path of the exhaust pipe. The plate is disposed between the top and the flange and serves as a reference in attaching the flange to the top. Thus, a work vehicle that can facilitate disposing an exhaust pipe and a tail pipe concentrically and provide better workability in disposing the exhaust pipe and the tail pipe concentrically, and a method for manufacturing the work vehicle, can be provided.

Abstract: An exhaust assembly includes an exhaust pipe, a first venturi member at the inlet end of the pipe and a second venturi member at the outlet end of the pipe. A diffuser/mixer is mounted at the outlet end of the exhaust pipe. A shield pipe surrounds a portion of the exhaust pipe. A shield member is mounted to the shield pipe and covers a portion of the first venturi member. The first and second venturi members operate to combine ambient air with exhaust gases.

Abstract: An exhaust aftertreatment system having a NOX absorber-catalyst and an ammonia-SCR reactor. During regenerations, the NOX absorber-catalyst generates ammonia. The ammonia-SCR reactor captures this ammonia and later uses it to reduce NOX. A Venturi is provided in an exhaust conduit connecting the NOX absorber-catalyst to the ammonia-SCR reactor. The Venturi draws sufficient air to keep the ammonia-SCR reactor under lean conditions throughout the NOX absorber-catalyst regenerations. Maintaining lean conditions for the ammonia-SCR reactor in this manner mitigates poisoning of the ammonia-SCR reactor by hydrocarbons slipping from the NOX absorber-catalyst during the regenerations. Mitigating this poisoning improves the performance of the exhaust aftertreatment system and reduce the loss of useful ammonia to oxidation.

Abstract: A method to extract hot exhaust gas from the exhaust flue and use its heat energy to vaporize aqueous reactive reagents such as aqueous ammonia or to provide a heated air process gas mixture. Compressed air provides motive force to induce a vacuum in an ejector venturi device which draws hot exhaust gas (“hot gas”) from the exhaust flue. In one embodiment the hot gas is drawn into a vaporizer unit. The heat energy in the hot gas vaporizes the injected aqueous reagent. The vaporized mixture is drawn into the ejector and is entrained in the motive air. The diluted reagent vapor mixture is injected back into the exhaust flue to support the selective catalytic reduction (SCR) process and reduce nitrogen oxide (NOx).

Abstract: A flow diffuser for vehicles of the type having an engine and an exhaust pipe generally includes a body having a first end configured for attachment to an exhaust pipe, and a diffusion portion including first and second diffusion sections, and a plurality of diversion wings disposed within the body.

Abstract: A throttleable exhaust venturi is described herein that generates strong suction pressures at an exhaust outlet by accelerating an incoming ambient fluid stream with the aid of a venturi to high gas velocities and injecting a combustion exhaust stream into the ambient fluid stream at an effective venturi throat. A mixing element downstream of the venturi throat ensures that the mixed fluid stream recovers from a negative static pressure up to local atmospheric pressure. A physical and the effective throat of the venturi are designed to promote mixing and stabilize the ambient fluid flow to ensure that high velocity is achieved and the effective venturi is operable over a variety of combustion exhaust stream mass flow rates.

Abstract: In an internal combustion engine having several combustion chambers formed in in-line cylinders wherein an air/fuel mixture can be combusted and which include a common cylinder head, with discharge passages formed within the cylinder head and extending to a common confluence zone in communication with a discharge manifold, the common confluence zone is delimited on a first side (A) by at least one cylinder head wall and a separate shell element on a second side mounted to the outside of the cylinder head, the shell element being curved funnel-like for conducting the exhaust gas away from the engine.

Abstract: An exhaust gas cooling apparatus and method for cooling an exhaust gas is provided. The exhaust cooling apparatus having a first fluid conduit having a variable nozzle opening disposed at one end of the first fluid conduit, the variable nozzle opening being defined by a shape memory alloy extending from the first fluid conduit; and a second fluid conduit having an inlet end and an outlet end, the variable nozzle opening being disposed in the second fluid conduit proximate to the inlet end of the second fluid conduit such that a fluid inlet opening is disposed about an outer periphery of the variable nozzle opening and an inner surface of the inlet end of the second fluid conduit, the shape memory alloy varying the size of the variable nozzle opening by moving toward or away from a center line of the first fluid conduit in response to a temperature of an exhaust gas flowing through the first fluid conduit.

Abstract: An aspirator includes converging and diverging cones, and singular support tube structure concentrically surrounding and mounting both the converging cone and the diverging cone and maintaining predetermined axial spacing and alignment of the cones in a cost-effective manufacturing assembly.

Abstract: An exhaust gas-cooling device for use on an exhaust gas conveyance system of a vehicle having an exhaust gas passageway to emit exhaust gases from an engine to an outlet includes an exhaust passageway pipe in fluid communication with the engine, and a micro-venturi mixing chamber pipe in fluid communication with and located downstream of the exhaust passageway pipe. The micro-venturi mixing chamber pipe defines the outlet of the exhaust gas-cooling device and has at least one aperture disposed on a pipe body of the micro-venturi mixing chamber for introducing ambient air into the micro-venturi mixing chamber pipe.

Abstract: A method of extending emissions performance of an exhaust after-treatment system of a vehicle that includes a dosing agent includes determining a level of a dosing agent source, selectively entering a limp-home mode based on the level and monitoring a catalyst temperature during said limp-home mode. Operation of an engine is regulated to increase the catalyst temperature when the catalyst temperature is less than a threshold catalyst temperature during the limp-home mode.

Abstract: An exhaust after-treatment system for a vehicle including a dosing agent that is selectively injected into an exhaust from a dosing agent supply includes a first module that determines a level of a dosing agent source. A second module selectively impedes vehicle operation by adjusting an engine operating mode if the level of said dosing agent source is below a threshold level.

Abstract: A diffuser for a work machine having an air breathing fuel consuming internal combustion engine with an exhaust aftertreatment device periodically elevating the exhaust temperatures to a high level. The diffuser has a venturi section and the excess contaminants from an intake air pre-cleaner are directed to the throat of the venturi to aspirate and dispose of excess contaminants while cooling the exhaust flow. Additional openings in the divergent section of the diffuser assist in providing significant reductions in exhaust temperatures within a short axial envelope.

Abstract: A system for manipulating engine exhaust gases away from inhabited areas comprises an air pressurization system coupled in fluid communication to a housing. The housing is adapted to reside adjacent a terminal portion of an exhaust pipe so that pressurized air injected into the housing entrains the exhaust gases and disperses them from the housing.

Abstract: A device for cooling a gas is provided. The device comprises an inlet having a first diameter, a mixing section downstream of the inlet and having a second diameter, and an opening in fluid communication with the mixing section and a source of air. The device is such that the second diameter is smaller than the first diameter and a vacuum is created for drawing in the air from the opening as gas passes from the inlet to the mixing section so that the air drawn into the mixing section mixes with the gas. A method for mixing two gases and an exhaust system are also provided.

Abstract: Unobstructed, pressurized air from the forward movement of a vehicle such as a pickup, SUV or automobile is forced into an air scoop (mounted to the undercarriage of the vehicle). This air is then channeled through a section of exhaust pipe (having the fewest possible bends) parallel (with an approximate 4? separation) along the muffler to the end of the tailpipe. A section of exhaust pipe (“crossover pipe”) is welded to the tailpipe outward at an acute angle which is then welded at an obtuse angle to the pressurized air pipe with both pipes being welded open to each other. As the pressurized air passes the crossover pipe, a vacuum is created in the crossover pipe pulling gases out of the tailpipe and then pushing them out of the pressurized air pipe, with this process reducing backpressure in the exhaust system and improving fuel economy.

Abstract: An exhaust device includes an exhaust pipe connected at its upstream end to a cylinder head of the engine and an exhaust muffler connected to the downstream end of the exhaust pipe for suppressing the generation of noise from a heat insulating cover that covers a part of the exhaust pipe. A heat insulating cover covers a portion of the exhaust pipe near the engine and a stay is fixed to the heat insulating cover. The stay includes a supporting plate portion curved so as to partially surround the outer circumference of the exhaust pipe. A first vibration isolating member is provided that is sandwiched between the outer circumference of the exhaust pipe and the supporting plate portion, a band member is tightened to mount the supporting plate portion to the exhaust pipe, and a second vibration isolating member is sandwiched between the supporting plate portion and the band member.

Abstract: A supercharging system for an internal combustion engine includes an exhaust introduction passage for introducing exhaust gas from an internal combustion engine; an exhaust discharge passage for introducing the exhaust gas from the exhaust introduction passage and exhausting the exhaust gas to an exterior; a mixture part arranged between the exhaust introduction passage and the exhaust discharge passage, for changing internal pressure into negative pressure upon accelerating flowing velocity of the exhaust gas with a narrowed flowing passage set to have a smaller diameter than the exhaust introduction pipe; an absorption passage for mixing outside air and the exhaust gas inside the mixture part upon introducing the outside air with use of negative pressure into an inside of the mixture part; and an intake passage for taking out and returning a part of mixed gas mixed inside the mixture part to a side of the internal combustion engine.

Abstract: A system for improving motor vehicle performance includes an air intake heat exchanger placed in-line with the air intake of the motor vehicle. The air intake heat exchanger is coupled to a source of pressurized media for selective application of the pressurized media to the air intake heat exchanger for cooling and drying intake air prior to reaching the intake manifold and ultimately the combustion chamber. The system further includes a flow inducing member positioned within the exhaust pipe of a motor vehicle. The flow inducing member is coupled to the source of pressurized media for selective application of the pressurized media in a manner which creates an increased flow within the exhaust system thereby increasing the flow through the air intake and intake manifold. A system for exhausting CO2 to an adjacent vehicle is also disclosed.

Abstract: The present invention 10 discloses a venturi that is installed perpendicularly to the end of the exhaust pipe 12 of a truck or like vehicle 14 thus resulting in the air flow through the venturi being at a 90 degree angle relative to the exhaust gases exiting the exhaust pipe. The present invention 10 seeks to increase the performance and efficiency of an engine of a vehicle 14 by overcoming the backpressure in the engine exhaust system created by the muffler baffles. The present invention 10 may also be installed on automobiles and other motor vehicles 14 having appropriately modified exhaust systems.

Abstract: In a waste heat recovery system wherein a heat exchanger derives heat from an engine exhaust, a venturi is fluidly connected to an engine exhaust port so as to thereby increase the flow rate and reduce the pressure in a manifold which is fluidly connected between the venturis and the heat exchanger. A fan is provided downstream of the heat exchanger to draw hot gases from the manifold, through the heat exchanger and discharge it to ambient. But when the fan is not operating during periods in which the engine is operating, the lower pressure manifold will draw ambient air in through the fan and through the heat exchanger, with the ambient air then being entrained in the exhaust gases being discharged from an exhaust channel downstream of the venturi. In one embodiment, a plurality of heat sources are provided with each having its own venturi connected to the common low pressure manifold.

Abstract: The invention relates to a method for purifying a gas flow, the method comprising spraying of water mist into the gas flow by utilizing at least one spray nozzle thereby causing a negative pressure in the immediate vicinity of the nozzle for sucking the gas flow into the sprayed spray. The method provides a simple and inexpensive method for purifying gases, such as exhaust gases from internal combustion engines. The invention further relates to an apparatus for implementing the method. The apparatus comprises a support structure (3) to which at least one spray nozzle (4) is arranged, the operation of the spray nozzle producing a suction that creates a negative pressure in the immediate vicinity of the spray nozzle.

Abstract: An internal combustion engine is provided with a vacuum pump (17) to remove burnt gases form the engine cylinders during an exhaust stroke. The vacuum applied by the pump (17) is sufficient to remove the gases during an exhaust stroke and also apply a force to lift the piston. A certain amount of torque is therefore generated during the exhaust strokes. In a similar manner and to similar effect a compressor (18) is provided to force fuel into the cylinders during induction strokes and also create a certain amount of positive torque.

Abstract: A modular engine enclosure comprised of a hood and baffle is provided to channel cooling air along passages formed between their adjacent surfaces to the radiator of a water cooled engine. The passages provide acoustic air barriers and along with selected enclosure surfaces covered with sound absorbing foam, serve to contain engine sounds within the enclosure. The passages receive air from a generally upright inlet opening and direct it evenly over the top surface of the horizontally oriented radiator. After being drawn through the radiator, the air is exhausted generally horizontally out the back of the engine compartment. The modular construction of the enclosure allows it to be easily raised and/or removed so that maintenance and service activities can be performed on the engine and its components.

Abstract: The aspiration device for vehicle engine exhaust systems includes a main housing having a top, a bottom and sidewalls with an open front and an open back. The open front has a larger cross-sectional area than the back and it is adapted to be mounted in the air stream of a vehicle. The device has an aerodynamic wing and a hollow inside with a wide leading edge and a narrow trailing edge and can be mounted within the main housing such that the leading edge of the wing faces the open front of the main housing. The trailing edge of the aerodynamic wing faces the open back of the main housing. The wing is located within the main housing so as to permit passage of air over and under the wing when the device is mounted in the air stream of a vehicle and the vehicle is moving forward. The wing has an exhaust outlet at the trailing edge and the wing has an exhaust inlet located on a sidewall of the main housing for attachment to a vehicle exhaust system.

Abstract: The present invention relates generally to an exhaust gas back pressure attenuator for truck exhaust stacks. In particular, the present invention is directed toward an improved exhaust gas deflector that reduces the back pressure within the vertical tubular exhaust stacks of over-the-road type tractor-trailer trucks. At highway speeds a number of factors may operate to make it difficult for the engine to force exhaust gas out of the system and into the atmosphere. The present invention is attached to the top of the stack and is designed to create an aerodynamic low-pressure condition that in effect pulls the exhaust gas from the stack, thereby reducing back pressure buildup, decreasing the load on the engine, and increasing the fuel efficiency. A first embodiment of the present invention employs an air wedge to divide a first ambient air volume and cause it to pass on either side of the exhaust stack, thereby creating a pressure differential which operates to pull the exhaust gases thereout.

Abstract: A cooling system for a vehicle having a radiator disposed above an engine, and a muffler disposed in a region below the engine. This system includes an air intake guide for guiding cooling air to the radiator from outside, an exhaust guide for guiding a large part of the cooling air having flowed past the radiator, forwardly of the vehicle, a cooling fan for producing air currents flowing from the air intake guide past the radiator to the exhaust guide, and ducts provided for opposite sides of the exhaust guide for guiding part of the cooling air having flowed passed the radiator into a muffler cover enclosing the muffler. The ducts communicate with positions of the muffler cover to blow the cooling air toward connections between exhaust pipes of the engine and the muffler.

Abstract: The present invention relates to a device for facilitating exhaust action of an internal combustion engine being used as a power-transmitting source of a vehicle, using a depression phenomenon resulted from induction and acceleration of air resistance due to forward movement of the vehicle (motor cars, vessels, airplanes or the like), thereby an output and a combustion efficiency of the internal combustion engine. To overcome problems of the forced exhaust method in the conventional internal combustion engine and improve the output and the combustion efficiency of the internal combustion engine, the present invention provides a device for facilitating exhaust action of the internal combustion engine comprising a guided flow depression device and a forced exhaust device, wherein combustion gases are exhausted by working fluids when the vehicle moves at a constant speed or more, and are exhausted by the forced exhaust device with the motor when the vehicle moves at a constant speed or less.

Abstract: An apparatus for driving a turbo supercharger (6) of an internal combustion engine (1) including an exhaust gas driven turbine (61) driving a compressor (62) for pressurizing engine intake air wherein a gas suction duct (10) is connected to the outlet (8) of the exhaust gas turbine (61), through which the exhaust gas flowing through the turbine is discharged, thereby sucking the exhaust gas discharged from the turbine and driving the turbine by simultaneous positive and negative pressures. The suction force is produced by a negative pressure generator (5) provided in the exhaust gas conduit (2) downstream of the exhaust gas turbine outlet.

Abstract: Apparatus for driving a turbosupercharger for an internal combustion engine wherein a negative pressure is generated by accelerating the exhaust gas flow. A turbine (40) is driven by the negative pressure generator (30) and a supercharging turbine (50) is operated by the turbine (40), so that as the suction air is pressurized beforehand, the energy of the exhaust gas flow acts on the turbine (40) by connecting the inlet of the turbine (40) to an exhaust system pipe (20). A low-pressure suction air flow acts on the downstream side of the turbine. In this way, the exhaust gas flow discharged to the turbine outlet is absorbed, and the turbine (40) is driven by the energy of the exhaust gas which flows through the exhaust system pipe (20) as well as by suction force of a powerful negative pressure, which is generated separately. A negative-pressure generator (30) is provided at the downstream end of the exhaust system pipe to generate the suction force.

Abstract: An anti-reversion exhaust system including an exhaust pipe and shroud attached to the exhaust pipe. The exhaust pipe and shroud cooperate to induce intersecting, generally opposed gaseous flows to effectively prevent reversionary flow in the direction of an associated internal combustion engine.

Abstract: The present invention provides a method of and an apparatus for driving a turbosupercharger wherein including an exhaust gas turbine (61) is driven by the exhaust gas energy of an internal combustion engine (1), and a supercharging turbine (62) is actuated driven by the exhaust gas turbine, so as to supercharge the engine with suction intake air; characterized in that suction air wherein exhaust gas, streams of in exhaust pipe (2) generate negative pressure (5) which is connection (10) to the turbine outlet (8) from which exhaust gas streams passed passing through the exhaust gas turbine are emitted, whereby the exhaust gas streams to flow to at the turbine outlet are is drawn off to assist in the driving of by suction, and the exhaust gas turbine is driven under a positive pressure and simultaneously under a negative pressure based on the force of the suction.

Abstract: A back pressure generator for affecting torque of an internal combustion engine having an exhaust system comprises a tubular housing, a main passage part for exhaust gas in the housing, a valve body movably supported in the main passage part for movement in response to the force of exhaust gas on the valve body, a valve seat in the main passage part which when engaged by the valve body closes the main passage part, a spring for resiliently urging the valve body towards the closed position having a predetermined force characteristic for moving the valve body into the closed position when the engine is idling and allowing the valve body to move in a direction downstream relative to the exhaust gas flow proportionally in response to the force of the exhaust gas on the valve body to a fully open position, regulating holes in the main passage engageable by the valve body for controlling the flow of exhaust gas through the main passage in response to the position of the valve body, and a separate passage in the hou

Abstract: An exhaust gas deflector for the top of a vertical tubular truck exhaust stack, the deflector being formed of a generally horizontal base plate having an opening therethrough, a vertical tubular pipe portion secured to the base plate coincident with the opening therein, the lower end of the tubular pipe portion being attached to the top of the truck exhaust stack, a pair of spaced apart side panels affixed to the base plate, an air scoop plate affixed to the front edge of the base plate and the side edges thereof affixed to the side panels, the air scoop plate being inclined downwardly and an upwardly inclined deflector plate affixed to the base plate rear edge and the side edges thereof being affixed to the side panels, so that as the truck having the exhaust gas deflector thereon moves, air passes through the deflector and is comingled with the exhaust gas which is deflected in an upward direction.

Abstract: An exhaust-driven cooling system for an internal combustion engine includes a turbocooler having an exhaust-driven turbine and fan means to generate a flow of cooling air for use in an internal combustion engine heat exchanger to dissipate heat losses of the engine. The system can provide internal combustion engines with substantially reduced temperatures and pressures for its exhaust gas and exhaust system components and substantially improved reliability and efficiency.

Abstract: An exhaust device for a working machine in which a mixing tubular member is disposed opposite to an outlet opening of the muffler through a space interposed between them, and an air-flow passage is provided to introduce a portion of pressurized air from a blower into the inside of an air guide wall on the outer periphery of the outlet opening.

Abstract: A power equipment includes an exhaust pipe member disposed near a muffler, the exhaust pipe member having an exhaust gas passage portion which communicates with the outlet of the muffler and an outlet passage portion whose downstream end has a downstream outlet end communicating with the atmosphere. The power equipment further includes a tubular member for introducing a portion of compressed air flow from a blower, and a gap is formed between an opening formed in the exhaust pipe member and an adjacent end of the tubular member. A guide tube member defines the opening in the interior of the upstream end of the exhaust pipe member.

Abstract: A diesel engine has a fresh-air intake, an exhaust-gas output, and a cooling system in which a liquid coolant is circulated. This system is provided with an antiexplosion system having an intake flame arrester in the intake and a jacketed exhaust-pipe section connected to the output and receiving exhaust gases therethrough from the engine. The cooling system is connected to the jacketed exhaust-pipe section to cool same and to cool the exhaust gases therein by indirect heat exchange with the coolant. An exhaust-gas heat exchanger is connected through the jacketed pipe section to the output. The cooling system is also connected to the heat exchanger to cool the exhaust gases therein by indirect heat exchange with the coolant. An output flame arrester is connected via another exhaust-pipe section to the heat exchanger for conducting cooled exhaust gas from the exchanger to the arrester.

Abstract: An exhaust back pressure reducer for use with an air deflector on top of the cab of a tractor for deflecting air over the tractor as the tractor pulls the trailer over the road. The back pressure reducer generally comprises a device at the top of the air deflector on the cab for aspirating exhaust gas from the engine exhaust system to reduce the exhaust back pressure on the engine. The aspirating device is positioned for flow therepast of air relative to the air deflector as the tractor travels forward and ported for suctioning gas therefrom by the air flowing therepast. The exhaust back pressure reducer further includes a connection between the engine exhaust system and the aspirating device for aspiration of exhaust gas from the exhaust system as the tractor travels forward over the road with attendant relative flow of air up and back over the air deflector and the aspirating device on top of the cab.

Abstract: An oil driven supercharger is disclosed with the turbine operating on oil from the lubricating system of an internal combustion engine or from a separate source of pressure oil. In the disclosed form of the invention, the turbine drives a pair of air compressors one at each end of a shaft to which the turbine rotor is centrally connected. The disclosed turbine is provided with several means for adjusting the flow rate of the oil used to drive the turbine to accommodate for different sizes of air compressors and different engine sizes. Also disclosed are several examples of how the paired air compressors may be connected to the intake manifold of an engine and/or to the exhaust manifold to dilute exhaust gases and assist in the combustion of uncombusted exhaust products.

Abstract: For recirculating the exhaust gas of an internal combustion engine, a recirculation line is provided which leads from the exhaust side to the intake side of the engine. A valve for controlling the recirculation rate is disposed in the line, and in order to prevent the formation of condensates in the line on the exhaust side when the valve is closed, a flushing line is provided which leads from the line segment on the exhaust side to a location point having lower pressure as compared with the exhaust side.

Abstract: An exhaust system of an internal combustion engine comprising an ejector provided in the exhaust pipe of the engine and a compressor driven by the engine. Pipes are provided for selectively supplying compressed air to a nozzle of the ejector and to the intake pipe of the engine by operating valves. The exhaust pipe of the engine is communicated with an exhaust pressure reducing chamber of the ejector. The valves are adapted to be operated by the throttle valve of the engine and are so arranged that the compressor is communicated with the ejector in part-open throttle operation and with the intake pipe in wide-open throttle operation.

Abstract: Means for accelerating the discharge of exhaust gas from an internal combustion engine, adapted to be mounted to the end of the engine exhaust pipe, in which exhaust gas from the engine is swirlingly guided by a plurality of spiral blades disposed in a tubular member, to form a super low pressure space at the center of the exhaust gas flow, thereby to accelerate the discharge of the exhaust gas.

Abstract: An apparatus for discharging to the atmosphere, combustion gases containing sulphur trioxide, means are provided for injecting into the stream, prior to venting to the atmosphere, a selected quantity of diluting gas. The diluting gas and sulphur containing combustion gases are turbulently mixed to provide dilution of the sulphur trioxide in the combined effluent from the stack. In one embodiment, the diluting gases are injected through a pipe positioned axially in the stack, below the top. A column of diluting gas is injected at high velocity into the upwardly moving combustion gases to entrain, mix with, and dilute the sulphur trioxide in the combination gases prior to escape from the stack to the atmosphere. In an improved embodiment, an annular plenum is constructed around the stack at a point upstream of the top of the stack, and a plurality of pipes are directed inwardly radially and upwardly through the wall of the stack.

Abstract: A deflector for reducing swirling flow spillover occurring when gas flowing hrough curved ducting attempts to exit into a freestream flow. When a gas flows through curved ducting it develops a swirling motion and when it attempts to exit into a freestream it is forced down over the sides of the duct by the strong freestream flow rushing past. The deflector is arcuately shaped and positioned upstream and adjacent the exit end of the curved ducting. As the freestream flow travels over the surface of the deflector, it is turned toward the direction of the flow from the exit of the ducting and draws the exiting flow along with it. The drawn exit flow is straightened and strengthened and is able to penetrate into the freestream flow. Further the ends of the deflector generate vortices which draw along the swirling flow at the sides of the exit end and straighten and strengthen it also. Thus the problem of swirling flow spillover of a gas exiting curved ducting into a freestream flow is substantially eliminated.