IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0585078
(2009-09-02)
|
등록번호 |
US-8578719
(2013-11-12)
|
우선권정보 |
GB-0820598.1 (2008-11-11) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
6 |
초록
▼
A noise reduction device 40, for example for use in a bleed assembly 30 of a gas turbine engine, comprises partitions 50, 52 forming cells 54 having apertures 56, 58, 60 which provide contractions and sudden expansions of flow passing through the device. The apertures 56, 58, 60 are disposed relativ
A noise reduction device 40, for example for use in a bleed assembly 30 of a gas turbine engine, comprises partitions 50, 52 forming cells 54 having apertures 56, 58, 60 which provide contractions and sudden expansions of flow passing through the device. The apertures 56, 58, 60 are disposed relative to each other so as to force the flow to change direction within the cells 54 to break up jets of gas issuing from the apertures 56, 58, 60. Webs 62, 64, 66 may be provided adjacent the apertures 56, 58, 60 to direct flow and to assist in generating turbulence.
대표청구항
▼
1. A bleed assembly for a gas turbine engine that in operation provides a flow of gas, the assembly comprising: a flow passage,a bleed valve at an inlet to the flow passage, anda noise reduction body extending across the flow passage, the noise reduction body having a cellular structure that include
1. A bleed assembly for a gas turbine engine that in operation provides a flow of gas, the assembly comprising: a flow passage,a bleed valve at an inlet to the flow passage, anda noise reduction body extending across the flow passage, the noise reduction body having a cellular structure that includes partitions which define a plurality of cells which communicate with one another through inlet and outlet apertures in walls of the cells to provide a plurality of flow paths through the noise reduction body,each cell having at least one of the inlet apertures and at least one of the outlet apertures, the inlet and outlet apertures each causing a contraction of the flow through the noise reduction body followed by sudden expansion of flow emerging into or from the respective cell, andthe apertures having increasing flow cross-sections in the direction of gas flow. 2. The bleed assembly as claimed in claim 1, wherein the at least one inlet aperture of at least one of the cells has a flow cross-section which is small relative to the flow cross-section through the respective cell. 3. The bleed assembly as claimed in claim 1, wherein the at least one inlet aperture of at least one of the cells is oriented to direct flow through the at least one inlet aperture towards an unapertured region of the cell wall. 4. The bleed assembly as claimed in claim 1, wherein the at least one inlet aperture and the at least one outlet aperture of at least one of the cells are disposed so that flow from the at least one inlet aperture to the at least one outlet aperture changes direction during passage through the cell. 5. The bleed assembly as claimed in claim 1, wherein the at least one inlet aperture of at least one of the cells is disposed in a cell wall which is perpendicular to a cell wall in which the at least one outlet aperture of that cell is disposed. 6. The bleed assembly as claimed in claim 1, wherein the at least one inlet aperture of at least one of the cells is disposed in a cell wall which is parallel to a cell wall in which the at least one outlet aperture of that cell is disposed, the inlet and outlet apertures of that cell being offset laterally from each other with respect to the flow direction through the apertures. 7. The bleed assembly as claimed in claim 1, further comprising a flow directing web situated adjacent at least one of the apertures. 8. The bleed assembly as claimed in claim 1, wherein adjacent cells communicate with each other via a common aperture constituting the outlet aperture of one of the adjacent cells and the inlet aperture of the other of the adjacent cells. 9. The bleed assembly as claimed in claim 1, wherein the partitions are disposed in intersecting arrays to form the cells. 10. The bleed assembly as claimed in claim 9, wherein the partitions in each array are parallel to each other. 11. The bleed assembly as claimed in claim 1, wherein the noise reduction body is manufactured by a stereolithographic process. 12. A gas turbine engine, comprising: a compressor,a bypass duct, andthe bleed assembly in accordance with claim 1,wherein the flow passage extends between the compressor and the bypass duct.
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