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中文摘要：
本文中研究了凹坑型非光滑车身表面的减阻特性。首先探讨了凹坑单元体矩形、菱形、等差等不同排列方式的减阻效果，选取了减阻效果较好的矩形排列方式；然后以单元体直径D、横向间距矽和纵向间距L为设计变量，以气动阻力最小为目标，采用拉丁方试验设计方法进行优化；接着利用CFD仿真得到各样本点的响应值，并据此建立Kriging近似模型；最后在验证了近似模型的可信度基础上，以近似模型进行全局优化。结果表明：凹坑单元体矩形排列最大可达7．62％的减阻效果。
英文摘要：
Drag reduction characteristic of pit-type non-smooth car body surface is studied in this paper. Firstly the drag reduction effects of rectangle, rhombus and equal-different pit arrangement are investigated, and the rectangular arrangement with better drag reduction effect is chosen. Then an optimization by the design of experi- ment with Latin Hypercube scheme is performed with the diameter and longitudinal and transverse spacing of pit as design variables and minimizing drag as objective. Next, the responses of different sample points are obtained by CFD simulation, and based on which a Kriging metamodel is built. Finally after the confidence of metamodel is verified a global optimization with the metamodel is conducted. The results show that a maximum drag reduction effect up to 7.62% can be achieved with rectangular pit arrangement.
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