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Reviews and Prospects in Turbulent Drag Reduction over Riblets Surface

Wang Jinjun (Beijing University of Aeronautics and Astronautics,Dept.of Flight Vehicle Design and Applied Mechanics)  
The experimental investigations of turbulent boundary layer flow,turbulent coherent structures,turbulent drag reduction and its mechanism have been reviewed.The experimental velocities cover subsonic,transonic and supersonic flows,and the content includes: (1) flow over flat plate,revolution body and wing with riblets surface at zero angle of attack;(2) the effect of pressure gradient,angle of attack and slide angle;(3) the burst characteristics,characteristics of turbulence,the streak structure in the near wall region and the drag reduction mechanism.In order to reduce the skin friction efficiently,more research works should be done on the characteristics of turbulent boundary layer,turbulent coherent structures and the mechanism of turbulent drag reduction for flow over riblets surfaces.
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