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    • 10. 发明申请
    • EXHAUST FLOW GUIDE FOR JET NOISE REDUCTION
    • 用于喷气式噪声减少的排气指导
    • WO2002103188A1
    • 2002-12-27
    • PCT/CA2002/000499
    • 2002-04-10
    • PRATT & WHITNEY CANADA CORP.
    • TSE, Man-Chun
    • F02K1/28
    • B64D33/06F02K1/34F02K1/38F02K1/386F02K1/44F02K1/46F02K1/48F02K1/50F05D2250/61Y02T50/671
    • A gas turbine engine includes an exhaust flow guide attached to the engine exhaust end. The exhaust flow guide is made of a piece of sheet metal curved about the central longitudinal axis of the engine to form a partial portion of a nozzle having curved leading and trailing edges, and side edges. The exhaust flow guide asymmetrically affects the downstream jet noise contribution volume of the exhaust gases discharged from the engine exhaust end to change the jet noise directivity and reduce its power level. The exhaust flow guide can further include additional features such as perforations, corrugated surfaces, reinforcing strips and irregularly shaped trailing edges to further improve the mixing of exhaust gas flow with surrounding fluid flow to further reduce the downstream jet noise contribution volume, thereby resulting in jet noise reduction. The exhaust flow guide according to the present invention also improves attenuation of engine noise generated in the engine and emitted from the engine exhaust end. The present invention provides a jet noise reduction device which is simple and economical to manufacture and maintain, and is applicable to both short and long cowl nacelle gas turbine engines.
    • 燃气涡轮发动机包括附接到发动机排气端的排气流动引导件。 排气流动引导件由围绕发动机的中心纵向轴线弯曲的一块金属板制成,以形成具有弯曲的前缘和后缘以及侧边缘的喷嘴的局部部分。 排气流动引导件不对称地影响从发动机排气端排出的废气的下游喷射噪声贡献体积,以改变喷射噪声方向性并降低其功率水平。 排气流动引导件还可以包括附加特征,例如穿孔,波纹表​​面,加强条和不规则形状的后缘,以进一步改善废气流与周围流体流的混合,以进一步减少下游喷气噪声贡献体积,从而导致喷射 降噪。 根据本发明的排气流动引导件还改善了发动机中产生的并从发动机排气端排出的发动机噪声的衰减。 本发明提供一种喷气降噪装置,其制造和维护简单经济,并且适用于短和长整流罩机舱燃气轮机。