[특허]Turbojet engine nozzle for attenuating core and turbine noise

Turbojet engine nozzle for attenuating core and turbine noise 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F01N-001/00
출원번호	US-0755836 (1976-12-30)
발명자 / 주소	Herman Gerald T. (Seattle WA)
출원인 / 주소	The Boeing Company (Seattle WA 02) Aeritalia S.p.A. (Naples ITX 03)
인용정보	피인용 횟수 : 72 인용 특허 : 0

초록 ▼

Core noise, a low frequency noise component believed to be partly caused by the combustion processes within the engine, and turbine noise, a higher frequency noise component caused by the interaction of high velocity gases with the engine\s turbine, are attenuated by noise absorbing structures that are disposed within the engine\s nozzle and that in part define the physical geometry of the nozzle duct. The nozzle is formed of an outer sleeve and an inner generally bulb-shaped plug which are coaxially arranged to define an annular nozzle duct that channels the flow of gases rearwardly from the outlet of the engine\s turbine. The plug has a hollow interior that is partitioned into a plurality of cavities that communicate with the nozzle duct via perforations provided in an outer wall of the plug. The size, shape and positioning of the interior cavities and outer plug wall perforations are selected so as to absorb noise energy existing in the exhaust gases, both at the relatively low frequencies characteristic of core noise and at the relatively higher frequencies characteristic of turbine noise.

대표청구항 ▼

In a noise attenuating nozzle assembly for a turbojet propulsion engine having an annular, core-exhaust port and in which said nozzle assembly is of the type having an annularly-shaped sleeve that has an inner wall surface, and further having a plug that has a central axis and an outer wall surface of generally circular transverse section, said plug being mounted substantially coaxially within said sleeve so as to define an annular, core-exhaust duct between the inner wall surface of said sleeve and the outer wall surface of said plug, said sleeve and said plug having forward ends adapted for attachment to such engine so that said annular duct forms a rearward extension of the engine\s annular core-exhaust port through which exhaust gases and associated core and turbine noise energy are rearwardly ducted, the improvement in said nozzle assembly comprising: acoustical structure integrated into said plug and including an acoustical liner having a perforated, outer wall defining the outer wall surface of said plug, and having a perforated inner wall spaced equidistantly inwardly from said outer wall, and core means sandwiched between said outer and inner walls for transmitting noise energy therebetween in directions oriented radially of said central axis of said plug; said inner wall bounding a generally hollow interior of said plug and said acoustical structure further including partitioning means disposed inside of said plug for dividing the interior of said plug bounded by said inner wall into a plurality of Helmholtz sound absorbing resonant cavities; and perforations in said outer wall and said core means of said acoustical liner being dimensioned so that said acoustical liner is a quarter wave absorber of noise energy within a first predetermined frequency range that substantially embraces said turbine noise energy, and perforations in said inner wall being dimensioned so that said acoustical liner cofunctions with said Helmholtz cavities to couple noise energy that exists within a second predetermined range of frequencies that substantially embraces said core noise energy from said duct through said acoustical liner and into said Helmholtz cavities for absorption thereby.

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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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연합인증

Turbojet engine nozzle for attenuating core and turbine noise 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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Turbojet engine nozzle for attenuating core and turbine noise 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (72)

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