|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||F02K-001/42 F02K-001/44 F02K-001/38|
|미국특허분류(USC)||060/264; 060/226.1; 060/230; 239/265.23; 181/220|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 1 인용 특허 : 9|
An embodiment of the invention is a technique to suppress noise in a jet engine. A substantially annular fan nozzle of a separate-flow turbofan engine includes a flow boundary surface and an outlet to discharge fan air into atmosphere. At least one vane extends substantially radially from the flow boundary surface to vector at least a portion of the fan air toward a direction where noise suppression is desired. The-vane is situated in proximity of the outlet and has a span substantially greater than a thickness of a local boundary layer of the fan air.
1. A turbofan noise suppression system comprising: a substantially annular fan nozzle and a core nozzle of a separate-flow turbofan engine, the fan nozzle having a flow boundary surface and an outlet to discharge a fan stream into atmosphere, the core nozzle discharging a primary stream into the atmosphere, the fan stream and the primary stream being substantially coaxial; anda plurality of vanes attached to the fan nozzle and extending substantially radially from the flow boundary surface, the vanes include a leading edge, an upper surface and a lower s...