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Published in:
2008 | OriginalPaper | Chapter
Experimental Optimization of Bionic Dimpled Surfaces on Axisymmetric Bluff Bodies for Drag Reduction
Authors : Chengchun Zhang, Luquan Ren, Zhiwu Han, Qingping Liu
Published in: IUTAM Symposium on Flow Control and MEMS
Publisher: Springer Netherlands
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The reduction of drag generated by axisymmetrica bluff bodies resulting from the control of the boundary layer with dimpled surfaces was investigated. A central composite design with 3 factors and 5 levels for each factor was used to optimize the parameters of the dimpled surfaces. Wind tunnel tests with a Mach number of 2.51 and a Reynolds number of 1.88 × 10
6
based on the maximum diameter of the model indicate that the dimples on the rearward configuration can reduce the viscous forebody drag by 4.98%, the base drag by 2.69%, and the total drag by 2.98%, respectively. By using the dimpled surface optimized by the quadratic regression equation, the total drag can be reduced by 3.81%.