2次元超音速ジェットスクリーチ

概要

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Screech is a tone produced at a discrete frequency by an imperfectly expanded super-sonic jet. An experimental investigation has been carried out on underexpanded and overexpanded air jets issuing from a convergent-divergent nozzle. In order to treat 2-dimensional flow of supersonic jets, we used a high aspect ratio rectangular nozzle and set side walls made of glass from the nozzle exit to about 300mm downstream. For the visualization of the jet flow and the sound field, a new system named Acoustically Triggered Pulse Laser Schlieren System has been developed. Two oscillation modes of the jet were observed. One is a flapping mode and the other is a symmetrical mode. The mode selection is dependent on the nozzle pressure ratio. It is also recognized that the sound source exists at some distance from the nozzle exit.
公益社団法人日本ガスタービン学会の論文
1994-03-10