[특허]Jet engine and method for reducing jet engine noise by reducing nacelle boundary layer thickness

Jet engine and method for reducing jet engine noise by reducing nacelle boundary layer thickness 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02K-003/02
출원번호	US-0658663 (1996-06-05)
발명자 / 주소	Blackner Anthony M.
출원인 / 주소	The Boeing Company
대리인 / 주소	Sproule
인용정보	피인용 횟수 : 24 인용 특허 : 11

초록 ▼

A jet engine has a noise reduction system which reduces the boundary layer located on the outer surface of the nacelle. The noise reduction system includes a plurality of openings located in the outer surface of the nacelle which are in communication with a source of low pressure. The low pressure causes a reduction in the boundary layer at the openings so that resulting ambient air flow velocity near the nacelle surface is increased. This causes a reduction in the shearing between the secondary and ambient airflows thereby reducing the noise.

대표청구항 ▼

[ What is claimed is:] [1.] A jet engine comprising:a. a nacelle having a forward end, and a rearward end, and which is located in an airstream such that a free airstream flow which is in contact with the nacelle creates a boundary layer at the outer surface of the nacelle;b. an engine, having a fan portion and a core portion, located inside the nacelle and discharging air at an outlet in a manner to generate noise;c. a suction surface having a plurality of openings and located in the outer surface of the nacelle at a location near the rearward end of the nacelle such that the openings are in communication with the boundary layer; andd. means, in communication with the openings, for reducing the pressure at the openings so that the boundary layer located rearward of the openings is smaller than the boundary layer located forward of the openings thereby reducing the noise from the discharged air.

이 특허에 인용된 특허 (11)

Isenberg Jack M. (Bellevue WA), Apparatus and method for manufacturing laminar flow control aircraft structure.
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Isenberg Jack M. (Bellevue WA), Apparatus and method for manufacturing laminar flow control aircraft structure.
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Johnson Warren A. (San Diego CA) Harding Geoffrey A. (Chula Vista CA), Arrangement for maintaining laminar air flow over gaps in aircraft engine nacelle surfaces.
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Nelson Philip A. (Southampton GB2) Fisher Michael J. (Southampton GB2) Rioual Jean-Luc (Southampton GB2), Control of boundary layer flow.
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Lahti Daniel J. (Cincinnati OH) Yates David E. (Cincinnati OH) Mungur Parmanand (West Chester OH) Stockman Norbert O. (Batavia OH), Hybrid laminar flow nacelle.
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Torkelson Delbert W. (Claremore OK), Jet engine noise reduction system.
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Lahti Daniel J. (Cincinnati OH) Younghans James L. (Cincinnati OH), Laminar flow necelle.
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Hunt James (Renton WA), Method and apparatus for laminar flow control.
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Savitsky Anatoly I. (Moscow RUX) Schukin Lev N. (Kaliningrad RUX) Karelin Viktor G. (Moscow RUX) Mass Aleksandr M. (Petropavlosk-Kamchatsk RUX) Pushkin Rostislav M. (Krasnoarmeisk RUX) Shibanov Anato, Method for control of the boundary layer on the aerodynamic surface of an aircraft, and the aircraft provided with the b.
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Papamoschou Dimitri (Mission Viejo CA), Method of eliminating mach waves from supersonic jets.
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Hughes Kevin A. (San Diego CA) Shieh Chih F. (San Diego CA), Turbine engine nacelle laminar flow control arrangement.
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이 특허를 인용한 특허 (24)

Napier, James C., Air inlet noise attenuation assembly.
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Hubert,Claude M.; Christy,Daniel P., Composite ice protection heater and method of producing same.
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Mardjono, Jacky Novi; Julliard, Jacques Michel Albert; Riou, Georges Jean Xavier, Device for acoustic treatment of the noise emitted by a turbojet.
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Hein, Jeffrey M.; Williams, Nicholas A.; Sheoran, Yogendra Y.; Lam, Cecilia S.; Cowans, Ora Morency; Higuera, Benjamen Kurt; Peduchi, Andrew Stephen; Sellahewa, Ravisha Pramod; Brown, Daniel, Dual action inlet door and method for use thereof.
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Hein,Jeffrey M.; Williams,Nicholas A.; Sheoran,Yogendra Y.; Lam,Cecilia S.; Cowans,Ora M.; Higuera,Benjamen K.; Peduchi,Andrew S.; Sellahewa,Ravisha P.; Brown,Daniel, Dual action inlet door and method for use thereof.
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Hein,Jeffrey M.; Williams,Nicholas A.; Sheoran,Yogendra Y.; Lam,Cecilia S.; Cowans,Ora Morency; Higuera,Benjamen Kurt; Peduchi,Andrew Stephen; Sellahewa,Ravisha Pramod; Brown,Daniel, Dual action inlet door and method for use thereof.
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Hein,Jeffrey M.; Williams,Nicholas A.; Sheoran,Yogendra Y.; Lam,Cecilia S.; Cowans,Ora Morency; Higuera,Benjamen Kurt; Peduchi,Andrew Stephen; Sellahewa,Ravisha Pramod; Brown,Daniel, Dual action inlet door and method for use thereof.
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Francisco, Jay M.; Jones, Anthony C.; Giddings, Greg R.; Thayalakhandan, Nagamany; Peel, Jason, Eductor exhaust silencer assembly with bypass gasflow.
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Burkett, Brian Bobby; Botura, Galdemir Cezar; Hubert, Claude Marc; Sweet, David Bert; Zecca, Joseph Christopher; Olson, Timothy Robert, Electric heater for integration into an aircraft acoustic panel.
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Francisco, Jay M.; Napier, James C., Exhaust silencer with baffles.
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Khalid, Syed Jalaluddin, Gas turbine engine with ejector.
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Khalid, Syed Jalaluddin, Gas turbine engine with ejector.
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Zecca, Joseph Christopher; Botura, Galdemir Cezar; Burkett, Brian Bobby; Hubert, Claude Marc; Layland, Michael John; Olson, Timothy Robert; Roman, James Michael, Ice protection system for a multi-segment aircraft component.
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Kruckenberg, Teresa M.; Pujar, Vijay V., Lightning strike protection.
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Kruckenberg, Teresa M.; Hill, Valerie A.; Mazany, Anthony Michael; Young, Eloise; Chiou, Song, Low density lightning strike protection for use in airplanes.
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Mani, Ramani; Graziosi, Paolo, Method and system for reduction of jet engine noise.
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Brittingham, David L.; Prybyla, Stanley G.; Christy, Daniel P., Methods of protecting an aircraft component from ice formation.
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Francisco, Jay M.; Napier, James C.; Sapiro, Dan G.; Hagshenas, Behzad, Mixed-flow exhaust silencer assembly.
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Papamoschou, Dimitri, Mixing enhancement using axial flow.
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Kruckenberg, Teresa M.; Hill, Valerie A., Nacelles and nacelle components containing nanoreinforced carbon fiber composite material.
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Glahn, Jorn A.; James, Denman H., On-demand lubrication system for improved flow management and containment.
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Booher, Sr., Benjamin V., Parasitic drag induced boundary layer reduction system and method.
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Khalid, Syed J., Positionable ejector member for ejector enhanced boundary layer alleviation.
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Dean, Thomas Andrew, Repair of acoustically treated structures.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Jet engine and method for reducing jet engine noise by reducing nacelle boundary layer thickness 원문보기