期刊
APPLIED ACOUSTICS
卷 180, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2021.108113
关键词
Large-scale open jet wind tunnel; Low-frequency pressure fluctuation; Jet noise; Instability wave
类别
资金
- National Key Research and Development Program of China [2017YFE0123300]
This study experimentally investigated low-frequency pressure fluctuations in a large-scale open jet wind tunnel, identifying two distinct fluctuations driven by different feedback loop paths. A formula for predicting the peak frequency was derived, and an effective control strategy was proposed to suppress resonances.
This paper experimentally investigated characteristics of low-frequency pressure fluctuations in a large-scale open jet wind tunnel using pressure transducers and far-field microphones. Two distinct low-frequency pressure fluctuations have been detected at the range of wind speeds between 50 m/s and 75 m/s. The two peak frequencies vary with the change of wind speed. Analysis results show that both the low-frequency pressure fluctuations are driven by the resonances of the large scale instability waves in the jet shear layer at two different feedback loop paths. One loop is through the entire circuit of the wind tunnel, another exists between the nozzle and the collector, which is termed as edge-tone feedback. A formula for predicting the peak frequency was derived and the prediction agrees well with the measurement. In addition, an effective control strategy to suppress the wind tunnel circuit resonance and the edge-tone feedback resonance were also presented. (C) 2021 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据