Predetermined control of turbulent boundary layer with a piezoelectric oscillator

doi:10.1088/1674-1056/25/1/014703

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 Re^θ 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.

Keywords: turbulent boundary layer predetermined control drag reduction piezoelectric oscillator

Received: 03 May 2015
Revised: 10 August 2015
Accepted manuscript online:

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, 11272233, and 11411130150) and the National Basic Research Program of China (Grant Nos. 2012CB720101 and 2012CB720103).

Corresponding Authors: Nan Jiang
E-mail: nanj@tju.edu.cn

Cite this article:

Xiao-Bo Zheng(郑小波), Nan Jiang(姜楠), Hao Zhang(张浩) Predetermined control of turbulent boundary layer with a piezoelectric oscillator 2016 Chin. Phys. B 25 014703

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