开式空腔气动声学特性及其流动控制方法

doi:10.7527/S1000-6893.2014.0294

Abstract

Abstract:

An experiment is conducted in a high-speed wind tunnel to research cavity flow aeroacoustic characteristics. A flow control method which can disturb cavity shear layer is used in this experiment. The length to depth ratio of the cavity is 4.1. Aeroacoustic characteristics and effect of flow control method are analyzed by using fluctuating pressure results measured under subsonic and transonic speed conditions. Mechanisms of self-sustained oscillation and flow control about open cavity flow are analyzed in this paper. Results indicate that the aeroacoustic environment is so bad that the maximum overall sound pressure level (OSPL) can reach 177 dB. There is strong self-sustained oscillation existing in the open cavity flow. Several tones of different modes can be found in the cavity sound pressure spectra. The cavity aeroacoustic environment can be worse when the shear layer interruption is adopted at subsonic speed but the reverse effect can be achieved at transonic speed.

Key words: cavity, flow control, overall sound pressure level, aeroacoustic noise, self-sustained oscillation, sound pressure spectra

CLC Number:

V211.7

WU Jifei, XU Laiwu, FAN Zhaolin, LUO Xinfu. Aeroacoustic characteristics and flow control method of open cavity flow[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015, 36(7): 2155-2165.

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Aeroacoustic characteristics and flow control method of open cavity flow

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