Effect of high-or low-speed fluctuations on the small-scale bursting events in an active control experiment

作     者：Xiao-Tong Cui Nan Jiang Zhan-Qi Tang 崔晓通;姜楠;唐湛棋

作者机构：Department of MechanicsTianjin UniversityTianjin 300354China Tianjin Key Laboratory of Modern Engineering MechanicsTianjin 300354China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2021年第30卷第1期

页      面：319-327页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.11972251 11732010 11572221 11502066 and 11872272) 

主　　题：turbulent boundary layer active control discrete wavelet decomposition small-scale bursting process 

摘      要：Active control of a fully developed turbulence boundary layer(TBL) over a flat plate has been investigated with a statistical view. The piezoelectric(PZT) oscillator is employed to produce periodic input into the inner region of the TBL.A wall probe is fixed upstream of the oscillator to identify the high-or low-speed fluctuations as the detecting ***, the impact of the detecting signals on the small-scale bursting process is investigated based on the data acquired by the traversing probe downstream of the oscillator. The results indicate that the small-scale bursting intensity is restrained more apparently at high-speed detecting fluctuations but less impacted at low-speed detecting fluctuations. Furthermore, the perturbed-scale fluctuations arrange the small-scale bursting process in the near-wall region. The detecting signals have an obvious impact on this arrangement, especially the high-intensity regions of the small-scale bursting events: the vibration enhances the intensity at high-speed detecting signals but weakens it at low-speed detecting signals in these regions, which gives a direct evidence on how detecting signals interfering the small-scale bursting process.