Abstract

Jet screech was eliminated by placing a spherical reflector at the nozzle exit of an underexpanded supersonic jet. The placement of the reflector minimized the sound pressure and this muted sound did not excite the unstable disturbance at the exit of nozzle and the loop of feedback mechanism disappeared, thus the generation of jet screech was cancelled. The proposed method was very effective in reducing overall sound pressure in the upstream region of the nozzle exit. Therefore, it could be a promising countermeasure against acoustic fatigue to protect the fuselage of an aircraft by incorporating it into a streamline form. The flow characteristic of the jet for the proposed system was observed by the Schlieren apparatus with a high speed video camera. A slit path was cut to the reflector for visualizing the jet properly. The shock structure of the jet was slightly modified and became more stable. [The research was supported by a grant from JSPS of the government of Japan.]

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