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| Simulation Analysis on Drag Reduction Performance of Characteristic Parameters of V–Groove on Local Approximate Plane |
| XU Yan, ZHANG Chen, WANG Zixuan |
| (Nanjing University of Aeronautics ＆ Astronautics, Nanjing 210016, China) |
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Abstract With the development of biomimetic surface engineering technology, the drag reduction characteristics of surface microtexture have been studied more and more, but its application is limited by the complex surface shape of the object and other conditions. A single microtexture is not applicable to the overall situation, and the overall analysis will consume a large amount of computing costs. In order to solve this problem, this paper adopts the idea of discrete, divides the complex surface into local facet to consider, and explores the drag reduction characteristics of micro-texture on local facet. Based on boundary layer theory, a design method of micro texture height and position is proposed, and in a small flat surface layout of different shape, depth, width and spacing of V–groove structure, using the method of computational fluid dynamics simulation of airflow in the small flat surface, various characteristic parameters for V–groove on the choice of drag reduction effects are explored. After analysis, the following rule can be obtained. When the flow velocity is 25m/s, the triangular micro-texture groove with depth of 0.2mm and width of 0.3mm has the best drag reduction effect, reaching 5.51% and the best dimensionless parameter y + =13.86. In microtexture designing, the dimensionless depth parameter is kept at about 14, which has the best drag reduction effect. The width to depth ratio of the drag reduction microtexture must be less than 1.5, and the smaller the spacing, the more obvious the drag reduction effect.
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2021, 
