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7533760 |
Noise reduction tubes
The invention uses tubes for the reduction of radiated duct noise. The tubes may be used to attenuate narrow band noise by diverting a portion of the acoustic energy through the tubes back into the...
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7308966 |
Device for reducing jet engine exhaust noise using oscillating jets
A device for reducing engine exhaust noise in an aircraft engine includes a number of oscillating jets which direct an oscillating flow into the engine exhaust. The oscillating jets are connected...
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7051523 |
Exhaust system assemblies employing wire bushings for thermal compensation
Exhaust system assemblies employ wire bushings for thermal compensation to minimize noise due to “stick-slip” while the system cools. In a preferred embodiment, the wire bushings are formed of...
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6901752 |
Exhaust processor with variable tuning system and method of operating such exhaust processor
An exhaust processor has an exhaust tube and a cover mounted for rotation at least partially around the exhaust tube to adjust the tuning frequency of the exhaust processor. A method of operating...
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6896100 |
Noise reducing apparatus and exhaust nozzle for jet engine
In order to reduce noise effectively and to provide a light-weight noise reducing apparatus and an exhaust nozzle for a jet engine, a mixer for mixing an exhaust gas and an external air is disposed...
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6705547 |
Active noise reducing nozzle
A nozzle where the sector into which noise reduction is sought (the direction of populated areas) has a moving lip, driven by actuators in an oscillatory, periodic or sinusoidal motion, around the...
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6427801 |
Apparatus for reducing noise in the jet engine
A apparatus and method for augmenting the thrust of a jet engine while reducing the noise generated thereby, including extending the thrust reverser sleeve, exposing the cascades while retaining...
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5941065 |
Stowable mixer ejection nozzle
An ejector nozzle (10) including an first cowling (12), a second cowling (14), and opposed upright sidewalls (16) that together form an internal nozzle exhaust path is provided. A reconfigurable...
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5821472 |
Supersonic aircraft exhaust noise suppression system
A method of reducing noise from a jet engine at a distance D from the engine comprising the step of up-shifting frequencies of noise from the jet engine to higher frequencies to cause increased...
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5801341 |
Mechanism of noise suppression system for a supersonic aircraft
A noise suppression system for a jet engine of an aircraft having a device for blocking a flow of exhaust gases down the exhaust nozzle of the engine, and a device for separating the exhaust gases...
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5717172 |
Sound suppressor exhaust structure
A sound suppressor exhaust structure for a jet engine. The exhaust structure has a nozzle body having a generally cylindrical forward intake opening to accommodate an aft end of a jet engine, and a...
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5517865 |
Vortex suppression for an eductor
A vortex suppressing flow eductor apparatus having a vortex filament producing flow eductor is provided with corresponding vortex destroying plates positioned and extending sufficiently downstream...
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5402963 |
Acoustically shielded exhaust system for high thrust jet engines
A flade exhaust nozzle for a high thrust jet engine is configured to form an acoustic shield around the core engine exhaust flowstream while supplementing engine thrust during all flight...
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5078631 |
Marine exhaust system
A marine exhaust system is provided for separating the gas from the water of gas/water mixture produced by a marine engine, and expelling the gas a sufficient distance from the hull of a boat to...
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5014933 |
Translating lip aircraft cowling structure adapted for noise reduction
The present invention comprises a cowling structure for a gas turbine aircraft engine which allows the aerodynamic characteristics of the inlet passageway to the engine to be varied in accordance...
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4934481 |
Arrangement for suppressing jet engine noise
According to the present invention, there is provided a jet engine comprising a cowl, an exhaust nozzle at the rear of the engine, a plurality of vanes that extend substantially circumferentially...
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4930308 |
Double-flow turboshaft engine with variable confluent nozzle
This invention relates to a double-flow turboshaft engine with confluent nozzle, i.e. of the type having a central generator emitting via its outlet orifice a flow of hot gas and an annular bypass...
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4754924 |
Variable geometry nozzle
A jet engine nozzle operable in a cruise setting and a noise attenuation setting. In the cruise setting the nozzle provides simple through flow. In the noise attenuation setting some ambient flow...
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4516660 |
Ejector and method for controlling jet engine noise
An ejector and method of reducing jet engine noise are disclosed wherein the primary combustion gas stream of the jet engine is ejected into a mixing section or zone of the ejector and into which a...
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4501393 |
Internally ventilated noise suppressor with large plug nozzle
A jet engine noise suppressor particularly adapted for supersonic aircraft. The nozzle (10) has an internal wall surface (70) around a generally centrally positioned body (50) and an annular area...
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4422524 |
Variable shape, fluid flow nozzle for sound suppression
The invention is an aircraft jet engine variable shape, fluid flow nozzle (10) which is adjustable to sound-suppression (take-off) and nozzle open (cruise) modes. In the take-off or...
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4306412 |
Jet engine and method of operating the same
A jet engine having its turbine section and exhaust nozzles particularly arranged to alleviate noise. There is a forward turbine section positioned in a first passageway to receive all or...
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4291782 |
Simplified method and apparatus for hot-shield jet noise suppression
A method and apparatus for selectively generating a noise suppressing hot gas shield are described. A portion of the jet engine exhaust flow is selectively directed to a nozzle which at least...
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4244294 |
Stowable nozzle plug and method for air breathing missile
A missile with an air breathing gas turbine propulsion engine configured with a translating exhaust plug nozzle to minimize longitudinal length of the engine section.
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3990530 |
Noise suppressor for turbine type power plant
A combined ejector and retractable suppressor to suppress jet noise occasioned by the hot gases discharging from the tail pipe of a gas turbine engine has a generally conical shaped duct member...
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3976160 |
Device for the attenuation of noise emission by the jet pipes of jet engines
A device for the attenuation of the noise emitted by a jet pipe of a jet ine and especially a composite jet pipe of an aircraft jet engine, by pinching of the jet with the aid of opposite panels...
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3927522 |
Aircraft gas turbine noise suppression
In an aircraft gas turbine installation having a jet pipe which extends downstream of the turbine by a distance at least equal to the jet pipe nozzle diameter, a plurality of moveable members are...
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3910375 |
Jet engine silencer
In and for a jet propulsion engine having a thrust nozzle adapted to exhaust a propulsive gas jet, said nozzle including wall means longitudinally bounding a hollow central body substantially...
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3844375 |
NOISE SHIELD FOR JET ENGINE EXHAUST
A sound suppression apparatus for a jet engine mounted within the tail portion of an aircraft fuselage wherein a pair of aerodynamic surfaces extend outwardly and upwardly on each side of the...
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3749316 |
SOUND SUPPRESSING THRUST AUGMENTING APPARATUS
An aircraft jet engine is provided with an ejector nozzle which suppresses the jet noise and augments the thrust during takeoff and climb while also optimizing the thrust during cruise. The ejector...
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3721314 |
SILENCER OR MUFFLER FOR THE COMPOSITE NOZZLE OF AN AIRCRAFT JET ENGINE
A silencer or muffler device for a jet engine nozzle efflux system, of the ype which includes a primary nozzle which emits into the divergent section of a secondary nozzle, formed by the inner wall...
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3710890 |
AIRCRAFT ENGINE NOISE SUPPRESSION
An exhaust nozzle noise suppression apparatus adapted for attachment to existing aircraft jet engines. The exhaust flow is directed by a centerbody plug into the inside of a series at least 20...
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3687222 |
DEVICE FOR DAMPING THE NOISE PRODUCED BY A GAS JET ESCAPING FROM A DUCT
A device for damping the noise produced by a jet escaping from a duct in ticular a jet engine nozzle, including silencer elements that are movable by control devices to project into the jet for...
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3667680 |
JET ENGINE EXHAUST NOZZLE SYSTEM
A variable area two-stage ejection nozzle exhaust system for a turbojet engine having an afterburner. wherein, a primary nozzle has spherical segments contained within a spherical shell housing...
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3664455 |
TWISTED VANE SOUND SUPPRESSOR FOR AIRCRAFT JET ENGINE
A plurality of vanes, each twisted about a longitudinal axis, and of airfoil sectional shape, are mounted peripherally about the exit end of a jet engine duct from which a jet exhaust stream is...
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3650472 |
THRUST CONTROL AND SOUND SUPPRESSION APPARATUS
Engine of either turbo fan or turbojet type is provided with multiple lobed exhaust nozzle. An ejector barrel defining a mixing zone is adapted to be connected at its leading edge to the lobe tips...
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3650348 |
SUPERSONIC NOISE SUPPRESSOR
A jet exhaust nozzle having articulated variable geometry segments attached to the downstream end of an exhaust duct and an actuator to articulate the segments between a corrugated subsonic noise...
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3625432 |
APPARATUS FOR DEFLECTING GAS TURBINE ENGINE EXHAUST GASES
A gas turbine jet propulsion engine has its turbine gas outlet angle and discharge nozzle plane coadapted to discharge the gas efflux from the nozzle at a specific angle to the engine axis. The...
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3613827 |
DEVICE FOR ATTENUATING NOISE EMITTED BY THE JET OF A JET ENGINE
The noise emitted by the jet of a jet engine is suppressed or in any event attenuated by a blading fitted in the exit section of the jet engine nozzle and designed with a lift-producing profile...
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3612399 |
VARIABLE DIRECTIONALLY SILENCED NOZZLE
A nozzle assembly for a gas turbine engine intended to effect noise reduction when the aircraft carrying the nozzle is landing or taking off. The nozzle is variable between a cruise configuration...
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3568792 |
SOUND-SUPPRESSING AND THRUST-REVERSING APPARATUS
Apparatus includes exhaust gas nozzle and at least two deflectors of arcuate cross section generally surrounding nozzle. Trailing edges of deflectors are serrated to form spikes. In first,...
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3550721 |
SILENCING ASSEMBLY FOR JET ENGINES
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3543877 |
SILENCER DEVICE FOR AN EJECTOR-TYPE JET PROPULSION NOZZLE
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3534831 |
JET ENGINE EXHAUST NOISE SUPPRESSION
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3527318 |
JET-ENGINE SILENCER
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3524588 |
SILENCER FOR AIRCRAFT JET ENGINES
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3495681 |
JET SILENCER FOR AN AIRCRAFT JET ENGINE
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3484847 |
THRUST SPOILING AND SILENCING IN A GAS TURBINE ENGINE
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3448825 |
PROCESS AND APPARATUS FOR SUPPRESSING JET ENGINE EXHAUST NOISE
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3443757 |
SUPERSONIC FLUID FLOW EXHAUST NOZZLES
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