中国物理B ›› 2016, Vol. 25 ›› Issue (1): 14703-014703.doi: 10.1088/1674-1056/25/1/014703

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Predetermined control of turbulent boundary layer with a piezoelectric oscillator

Xiao-Bo Zheng(郑小波), Nan Jiang(姜楠), Hao Zhang(张浩)   

  1. 1. Department of Mechanics, Tianjin University, Tianjin 300072, China;
    2. Tianjin Key Laboratory of Modern Engineering Mechanics, Tianjin 300072, China
  • 收稿日期:2015-05-03 修回日期:2015-08-10 出版日期:2016-01-05 发布日期:2016-01-05
  • 通讯作者: Nan Jiang E-mail:nanj@tju.edu.cn
  • 基金资助:

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

Predetermined control of turbulent boundary layer with a piezoelectric oscillator

Xiao-Bo Zheng(郑小波)1, Nan Jiang(姜楠)1,2, Hao Zhang(张浩)1   

  1. 1. Department of Mechanics, Tianjin University, Tianjin 300072, China;
    2. Tianjin Key Laboratory of Modern Engineering Mechanics, Tianjin 300072, China
  • Received:2015-05-03 Revised:2015-08-10 Online:2016-01-05 Published:2016-01-05
  • Contact: Nan Jiang E-mail:nanj@tju.edu.cn
  • Supported by:

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

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摘要：

With a piezoelectric (PZT) oscillator, the predetermined controls of the turbulent boundary layer (TBL) are effective in reducing the drag force. The stream-wise velocities in the TBL are accurately measured downstream of the oscillator driven by an adjustable power source. The mean velocity profiles in the inner and outer scales are reported and the skin friction stresses with different voltage parameters are compared. Reduction of integral spatial scales in the inner region below y+ of 30 suggests that the oscillator at work breaks up the near-wall stream-wise vortices responsible for high skin friction. For the TBL at Reθ of 2183, the controls with a frequency of 160 Hz are superior among our experiments and a relative drag reduction rate of 26.83% is exciting. Wavelet analyses provide a reason why the controls with this special frequency perform best.

关键词: turbulent boundary layer, predetermined control, drag reduction, piezoelectric oscillator

Abstract:

With a piezoelectric (PZT) oscillator, the predetermined controls of the turbulent boundary layer (TBL) are effective in reducing the drag force. The stream-wise velocities in the TBL are accurately measured downstream of the oscillator driven by an adjustable power source. The mean velocity profiles in the inner and outer scales are reported and the skin friction stresses with different voltage parameters are compared. Reduction of integral spatial scales in the inner region below y+ of 30 suggests that the oscillator at work breaks up the near-wall stream-wise vortices responsible for high skin friction. For the TBL at Reθ of 2183, the controls with a frequency of 160 Hz are superior among our experiments and a relative drag reduction rate of 26.83% is exciting. Wavelet analyses provide a reason why the controls with this special frequency perform best.

Key words: turbulent boundary layer, predetermined control, drag reduction, piezoelectric oscillator

中图分类号:  (Drag reduction)

  • 47.85.lb
47.85.ld (Boundary layer control) 47.27.nb (Boundary layer turbulence ?) 47.27.De (Coherent structures)