| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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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 |
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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.
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Received: 24 September 2020
Revised: 15 October 2020
Accepted manuscript online: 05 November 2020
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PACS:
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47.85.lb
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(Drag reduction)
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47.85.ld
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(Boundary layer control)
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47.27.nb
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(Boundary layer turbulence ?)
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47.27.De
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(Coherent structures)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11972251, 11732010, 11572221, 11502066, and 11872272). |
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Corresponding Authors:
†Corresponding author. E-mail: nanj@tju.edu.cn ‡Corresponding author. E-mail: zhanqitang@tju.edu.cn
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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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