Turbomachine nozzle cover for reducing jet noise
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02K-001/46
F02K-001/00
출원번호
US-0178476
(2005-07-12)
등록번호
US-7392651
(2008-07-01)
우선권정보
FR-04 07792(2004-07-13)
발명자
/ 주소
Goutines,Marius
Julliard,Jacques Michel Albert
Loheac,Pierre
Miroudot,Fr��d��ric Raymond Jean
Nogues,Jean Michel
Thomas,St��phane
출원인 / 주소
Snecma
대리인 / 주소
Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
인용정보
피인용 횟수 :
4인용 특허 :
6
초록▼
A cowl for a turbomachine nozzle, the cowl having a plurality of repeated patterns disposed circumferentially at a trailing edge, each pattern being asymmetrical about a midplane of the pattern containing a longitudinal axis of the cowl, and each pattern having a first portion inclined radially towa
A cowl for a turbomachine nozzle, the cowl having a plurality of repeated patterns disposed circumferentially at a trailing edge, each pattern being asymmetrical about a midplane of the pattern containing a longitudinal axis of the cowl, and each pattern having a first portion inclined radially towards the inside of the cowl and a second portion inclined radially towards the outside of the cowl.
대표청구항▼
What is claimed is: 1. A cowl for a turbomachine nozzle, the cowl having a plurality of repeated patterns disposed circumferentially at a trailing edge, wherein each pattern is asymmetrical about a midplane of the pattern containing a longitudinal axis of said cowl, wherein each pattern comprises a
What is claimed is: 1. A cowl for a turbomachine nozzle, the cowl having a plurality of repeated patterns disposed circumferentially at a trailing edge, wherein each pattern is asymmetrical about a midplane of the pattern containing a longitudinal axis of said cowl, wherein each pattern comprises a first portion inclined radially towards the inside of the cowl and a second portion inclined radially towards the outside of the cowl, and wherein each pattern is in a shape of a quadrilateral having a base common with said cowl. 2. A cowl according to claim 1, wherein the first portion of each pattern extends longitudinally over a distance that is greater than the distance over which the second portion of said pattern extends. 3. A cowl according to claim 1, wherein the inclination distance of the first portion of each pattern is greater than the inclination distance of the second portion of said pattern. 4. A cowl according to claim 1, wherein the inclination distances of the first and second portions of each pattern lies in the range 5% to 30% of the respective distance over which each of said portions extends longitudinally. 5. A cowl according to claim 1, wherein the first portion of each pattern extends longitudinally over a distance greater than half the circumferential distance occupied by a pattern, and wherein the second portion of each pattern extends longitudinally over a distance that is less than half said circumferential distance occupied by a pattern. 6. A cowl according to claim 1, wherein the patterns are fin-shaped. 7. A cowl according to claim 1, wherein the patterns are disposed symmetrically about a vertical plane containing the longitudinal axis of the cowl. 8. A cowl according to claim 1, wherein a gap is provided in the trailing edge of the cowl having no pattern in the vicinity of the zone where said cowl is connected to a support pylon. 9. A turbomachine nozzle including a primary cowl disposed about a longitudinal axis of the nozzle, and a secondary cowl disposed concentrically around the primary cowl, wherein the primary cowl is a cowl according to claim 1. 10. A turbomachine including a nozzle according to claim 9. 11. A turbomachine nozzle including a primary cowl disposed about a longitudinal axis of the nozzle, and a secondary cowl disposed concentrically around the primary cowl, wherein the secondary cowl is a cowl according to claim 1. 12. A turbomachine nozzle including a primary cowl disposed about a longitudinal axis of the nozzle, and a secondary cowl disposed concentrically around the primary cowl, wherein the primary and secondary cowls are cowls according to claim 1. 13. A cowl according to claim 1, wherein said quadrilateral is delimited by four straight line segments. 14. A cowl according to claim 1, wherein said quadrilateral has its two diagonals inside said quadrilateral. 15. A cowl according to claim 1, wherein said quadrilateral has apexes opposed to said base, wherein said apexes correspond to respective longitudinal ends of the first and second portions of each pattern. 16. A cowl according to claim 1, wherein two adjacent patterns are not mirror-images of each other. 17. A cowl according to claim 1, wherein said quadrilateral has, in addition to said base in common with said cowl, three sides that form edges of said cowl. 18. A cowl according to claim 17, wherein a first side and a second side of said three sides each forms an angle β relative to said longitudinal axis, wherein said angle β is within a range of 15�� to 45��. 19. A cowl according to claim 18, wherein said angle β is about 30��. 20. A cowl according to claim 18, wherein a third side of said three sides, opposite said base, forms an angle ϒ relative to an axis perpendicular to said longitudinal axis, wherein said angle ϒ is within a range of 15�� to 45��. 21. A cowl according to claim 20, wherein said angle ϒ is about 30��. 22. A cowl according to claim 17, wherein said quadrilateral has rounded corners. 23. A turbomachine nozzle comprising a cowl according to claim 1, wherein said nozzle is axially symmetrical in shape about said longitudinal axis of said cowl.
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이 특허에 인용된 특허 (6)
Mundt, Christian, Bloom mixer for a turbofan engine.
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Au, Dax; Bigot, Pascal Moise Michel; Briend, Pierre; Loheac, Pierre Philippe Marie, Turbomachine nozzle cover provided with triangular patterns having pairs of vertices for reducing jet noise.
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