B-22 混合制御デバイスを使ったジェット騒音抑制(ジェット騒音,一般講演)

概要

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It has widely been recognized that jet noise has close relationship with mixing process in shear layer of plume. This paper describes experimental study on two mixing control devices for jet noise suppression. One device is a notched nozzle classified as a passive device. The revised 18-notched nozzle showed sufficient reduction in PNL, keeping high-frequency noise suppressed. The other is an air-injector, an active device blowing secondary air into plume. An appropriate amount of injection provided as much noise reduction as the revised notched nozzle. For better understanding of the mixing process by those devices, measurement of pressure distribution in the plume was carried out. Results indicated that deformation of shear layer due to each device appears in limited region just after the nozzle lip.
公益社団法人日本ガスタービン学会の論文
2010-10-20