球面反射板による噴流の空力音響制御(J13-2 空力音II,J13 流体関連の騒音と振動)

概要

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Experiments were cameo out to control the screech tone generated from a supersonic jet by using a spherical reflector. The reflector was placed at the nozzle exit which minimized the sound pressure at the exit region. The weak sound pressure did not excite the unstable disturbances at the exit and thus the loop of the feedback mechanism could not be accomplished and the jet screech was eliminated. Experimental results indicate that the new system suppresses not only the screech tones but also the broadband noise components and reduces the overall sound pressure level of the jet. A good performance in controlling jet noise was found as the reflector was placed at the nozzle exit; however, the position of the reflector was changed to the upstream direction for improving the performance of jet screech cancellation at high pressure ratio and found good result.
2004-09-04