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Chin. Phys. B, 2021, Vol. 30(1): 014702    DOI: 10.1088/1674-1056/abc7a9

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

Xiao-Tong Cui(崔晓通)1, Nan Jiang(姜楠)1,2,†, and Zhan-Qi Tang(唐湛棋)1,2,
1 Department of Mechanics, Tianjin University, Tianjin 300354, China; 2 Tianjin Key Laboratory of Modern Engineering Mechanics, Tianjin 300354, China
Abstract  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 signals. Then, 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.
Keywords:  turbulent boundary layer      active control      discrete wavelet decomposition      small-scale bursting process  
Revised:  15 October 2020      Published:  30 December 2020
PACS: (Drag reduction)  
  47.85.ld (Boundary layer control)  
  47.27.nb (Boundary layer turbulence ?)  
  47.27.De (Coherent structures)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11972251, 11732010, 11572221, 11502066, and 11872272).
Corresponding Authors:  Corresponding author. E-mail: Corresponding author. E-mail:   

Cite this article: 

Xiao-Tong Cui(崔晓通), Nan Jiang(姜楠), and Zhan-Qi Tang(唐湛棋) Effect of high-or low-speed fluctuations on the small-scale bursting events in an active control experiment 2021 Chin. Phys. B 30 014702

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