低阻车身形体的参数化建模与气动试验

A Parametric Modeling Method of Low drag Car Body and Aerodynamic Test

摘要:

用控制点和曲线对车身的侧视图、俯视图和横截面图进行参数化，结合试验设计和局部加密的方法对2维车身进行优化得到全局较优解.从2维优化车身出发，构建不带车轮的2个3维车身形体.计算得到它们的气动阻力系数分别为0.057和0.089，可以作为低阻形体为理想车身的相关研究提供参考.缩比模型的风洞试验结果与数值计算结果基本吻合，验证了低阻车身形体参数化建模方法的可行性.

Abstract:

The frontal view, top view and cross sections of low drag car body were parameterized with control points and curves. Then the two dimension car body was optimized by design of experiments and local refinement methods. The global optimum results were obtained. Two three dimension car bodies without wheels were built based on the optimized two dimension car bodies，and their coefficients of aerodynamic drag were as low as 0.057 and 0.089 respectively. They could serve as low brag basic bodies for the future research of an ideal car. The agreement between test results and numerical results indicates that this parametric modeling method of low drag car body is feasible.