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NUMERICAL SIMULATION AND EXPERIMENTAL STUDY OF dragREDUCING SURFACE OF A REAL SHARK SKIN

Journal of Hydrodynamics 2011年第2期23卷 204-211页

作者： ZHANG De-yuan LUO Yue-hao LI Xiang CHEN Hua-wei School of Mechanical Engineering and Automation Beihang University Beijing 100191 China

It is well known that shark skin surface can effectively inhabit the occurrence of turbulence and reduce the wall friction, but in order to understand the mechanism of drag reduction, one has to solve the problem of the turbulent flow on grooved-scale surface, and in that respect, the direct numerical simulation is an important tool. In this article, based on the real biological shark skin, the model of real shark skin is built through high-accurate scanning and data processing. The turbulent flow on a real shark skin is comprehensively simulated, and based on the simulation, the drag reduction mechanism is discussed. In addition, in order to validate the drag-reducing effect of shark skin surface, actual experiments were carried out in water tunnel, and the experimental results are approximately consistent with the numerical simulation.

关键词： numerical simulation experimental study biomimetic surface shark skin drag reduction mechanism

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Experimental Study of Turbulent Boundary Layers on Groove/Smooth Flat Surfaces

引用

Journal of Thermal Science 2005年第3期14卷 193-197页

作者： Hongwei MA Qiao TIAN Hui WU School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing 100083 China

This paper presents an experimental investigation of the turbulent boundary layers on both groove and smooth flat surfaces. The flow structures were shown in a water tunnel using the hydrogen-bubble flow visualization technique. The measurement results indicate that: (1) the grooves can effectively reduce accumulation of low-speed fluids, decrease the number of the low-speed streaks and depress oscillation of the streaks in the sublayer; (2) the grooves can restrain forming of the horseshoe vortices in the buffer region; (3) the grooves bate oscillation and kinking of the quasi-streamwise vortices and restrain production of the hairpin vortices and the ring vortices, reducing both frequency and intensity of the turbulence bursting; (4) the grooves directly affect the flow structures in the sublayer of the boundary layer and then modulate the flow field up to the buffer region and the logarithmic region by restraining development and interaction of the vortices.

关键词： streamwise groove turbulent boundary layer drag reduction mechanism coherent structure hydrogen-bubble flow visualization

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