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1. Experiment about drag reduction of bionic roughened | |||
Tian Limei ,Ren Luquan,Han Zhiwu ,Zhang Shicun | |||
Engineering and Technological Science 09 January 2009 | |||
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Abstract:The body surface of some organisms has roughened structure, which is related to drag reduction in moving fluid. To imitate these structures, models with a roughened surface were made. In order to find a relationship between drag reduction and the roughened surface, an orthogonal design test was employed in a low speed wind tunnel. Six factors likely to influence drag reduction were considered, and each factor tested at three levels. The six factors were the configuration, diame-ter/bottom width, height/depth, distribution, the arrangement of the rough structures on the experimental model and the wind speed. It was shown that the roughened surface causes drag reduction, and the distribution of roughening structures on the model, and wind speed, are the predominant factors affecting drag reduction. Using analysis of variance, the optimal com-bination and levels were obtained, which were a wind speed of 44 m/s, distribution of the roughened structure on the tail of the experimental model, the configuration of riblets, diameter/bottom width of 1 mm, height/depth of 0.5 mm, arranged in a rhombic formation. At the optimal combination mentioned above, the 90% confidence interval for drag reduction was (12.99%, 18.93%). | |||
TO cite this article:Tian Limei ,Ren Luquan,Han Zhiwu , et al. Experiment about drag reduction of bionic roughened [OL].[ 9 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27581 |
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