| 摘要 |
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 exhau st flow guide asymmetrically affects the downstream jet noise contribution volu me of the exhaust gases discharged from the engine exhaust end to change the je t noise directivity and reduce its power level. The exhaust flow guide can further include additional features such as perforations, corrugated surface s, 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 fro m 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.
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