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Chin. Phys. B, 2018, Vol. 27(7): 074701    DOI: 10.1088/1674-1056/27/7/074701
ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS Prev   Next  

Active control of wall-bounded turbulence for drag reduction with piezoelectric oscillators

Jian-Xia Bai(白建侠)1,2, Nan Jiang(姜楠)1,3, Xiao-Bo Zheng(郑小波)1, Zhan-Qi Tang(唐湛琪)1, Kang-Jun Wang(王康俊)1, Xiao-Tong Cui(崔晓通)1
1 Department of Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300350, China;
2 Deptartment of Mathematics, Tianjin University Renai College, Tianjin 301636, China;
3 Tianjin Key Laboratory of Modern Engineering Mechanics, Tianjin 300072, China
Abstract  An experimental investigation was performed for active control of coherent structure bursting in the near-wall region of the turbulent boundary layer. By means of synchronous and asynchronous vibrations with double piezoelectric vibrators, the influence of periodic vibration of the double piezoelectric vibrators on the mean velocity profile, drag reduction rate, and coherent structure bursting is analyzed at Reθ=2766. The case with 100 V/160 Hz-ASYN is superior to other conditions in the experiment and a relative drag reduction rate of 18.54% is exciting. Asynchronous vibration is more effective than synchronous vibration in drag reduction at the same voltage and frequency. In all controlled cases, coherent structures at large scales are regulated while the small-scale structures are stimulated. The fluctuating velocity increases significantly. A periodic regulating effect on the coherent structure can be seen in the ASYN control conditions at the frequency of 160 Hz.
Keywords:  turbulent boundary layer      active control      double piezoelectric vibrators  
Received:  15 February 2018      Revised:  02 April 2018      Published:  05 July 2018
PACS:  47.85.lb (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. 11332006, 11732010, 11572221, and 11502066).
Corresponding Authors:  Nan Jiang     E-mail:  nanj@tju.edu.cn

Cite this article: 

Jian-Xia Bai(白建侠), Nan Jiang(姜楠), Xiao-Bo Zheng(郑小波), Zhan-Qi Tang(唐湛琪), Kang-Jun Wang(王康俊), Xiao-Tong Cui(崔晓通) Active control of wall-bounded turbulence for drag reduction with piezoelectric oscillators 2018 Chin. Phys. B 27 074701

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