Experimental study on spectrum and multi-scale nature of wall pressure and velocity in turbulent boundary layer  

作　　者：郑小波 姜楠 

机构地区：[1]Department of Mechanics,Tianjin University [2]Tianjin Key Laboratory of Modern Engineering Mechanics [3]The State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2015年第6期385-394,共10页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant Nos.2012CB720101 and 2012CB720103);the National Natural Science Foundation of China(Grant Nos.11272233,11332006,and 11411130150)

摘　　要：When using a miniature single sensor boundary layer probe, the time sequences of the stream-wise velocity in the turbulent boundary layer （TBL） are measured by using a hot wire anemometer. Beneath the fully developed TBL, the wall pressure fluctuations are attained by a microphone mechanism with high spatial resolution. Analysis on the statistic and spectrum properties of velocity and wall pressure reveals the relationship between the wall pressure fluctuation and the energy-containing structure in the buffer layer of the TBL. Wavelet transform shows the multi-scale natures of coherent structures contained in both signals of velocity and pressure. The most intermittent wall pressure scale is associated with the coherent structure in the buffer layer. Meanwhile the most energetic scale of velocity fluctuation at y＋ = 14 provides a specific frequency f9 ≈ 147 Hz for wall actuating control with Ret = 996.When using a miniature single sensor boundary layer probe, the time sequences of the stream-wise velocity in the turbulent boundary layer （TBL） are measured by using a hot wire anemometer. Beneath the fully developed TBL, the wall pressure fluctuations are attained by a microphone mechanism with high spatial resolution. Analysis on the statistic and spectrum properties of velocity and wall pressure reveals the relationship between the wall pressure fluctuation and the energy-containing structure in the buffer layer of the TBL. Wavelet transform shows the multi-scale natures of coherent structures contained in both signals of velocity and pressure. The most intermittent wall pressure scale is associated with the coherent structure in the buffer layer. Meanwhile the most energetic scale of velocity fluctuation at y＋ = 14 provides a specific frequency f9 ≈ 147 Hz for wall actuating control with Ret = 996.

关 键 词：multi-scale coherent structures hot wire anemometry MICROPHONE wavelet transform 

分 类 号：O357.5[理学—流体力学]