Skin Friction Drag Reduction Based on Unsteady Blowing Through One Array of Streamwise Slits
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An experimental study is conducted to reduce the skin friction drag in a turbulent boundary layer using periodic blowing through one array of streamwise slits. The blowing amplitude and frequency have been investigated and found to have great effects on the control performance. A maximum local skin friction reduction of 70 % has been observed at 33 wall unit downstream of the actuators, which is connected to a greatly enhanced mean energy dissipation rate based on the analysis of the hotwire and PIV data.
KeywordsTurbulent boundary layer Drag reduction Active control
YZ wishes to acknowledge support from NSFC grant 11172085 and from Shenzhen Government grants JCYJ20120613144508935 and JCYJ20130402100505796.
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