Experimental study on flat plate skin friction control by porous media based on global fluorescent oil film measurement technology

Author:

Du Hai12ORCID,Jiang Hao3,Yang Zhangyi3,Chen Shuo3,Xia Haoyang3,Zhang Wenxiao1

Affiliation:

1. School of Aeronautics and Astronautics, Xihua University, Chengdu 610039, China

2. National Key Laboratory of Science and Technology on Aerodynamic Design and Research, Northwest Polytechnical University, Xi'an 710072, China

3. Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu 610039, China

Abstract

Skin friction is a primary source of total aircraft drag. It is important, therefore, in science and engineering, to achieve drag reduction control in a boundary layer. In this paper, under the experimental conditions of Re θ = 5909 ( x/c = 0.55) and with a zero-pressure gradient, the drag reduction control of a plate boundary layer in porous media is studied. The global skin friction of the plate is measured using fluorescent oil film test technology. The results show that, in contrast with the downstream frictional resistance coefficient of a flat plate that possesses a smooth surface, the coefficient for porous media reduced significantly. Also, the lower the pores per inch (PPI) of the porous media, the greater the drag reduction effect. Among the three porous media with different PPI, porous media with ten PPI has the best drag reduction effect. With increasing distance from the porous media, the drag reduction effect decreases gradually. Porous media significantly increase the slope of the logarithmic region of the velocity profile of the downstream turbulent boundary layer, the dimensionless wall velocity u+ moves upward, and the velocity pulsation in the logarithmic region increases so as to reduce skin friction.

Funder

National Natural Science Foundation of China

foundation of National Key Laboratory of Science and Technology on Aerodynamic Design and Research

Publisher

AIP Publishing

Subject

Condensed Matter Physics,Fluid Flow and Transfer Processes,Mechanics of Materials,Computational Mechanics,Mechanical Engineering

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