关键词: 凹坑型非光滑表面, 尾部气流, 减阻特性, 优化设计

Abstract:

Taking aerodynamic drag characteristics of the pit non-smooth surface rear vehicle body as the research object, a kind of optimization method about aerodynamic drag reduction of non-smooth surface was discussed by combining parametric modeling, the CFD(computational fluid dynamics) calculation and the numerical optimization method. By analyzing aerodynamic drag reduction effect of rectangular arrangement of pit non-smooth unit body, setting rectangular arrangement and non-smooth unit body as optimization objective,and the Latin Hypercube Sampling method was used to select sample data. The response values corresponding to the sample were achieved by CFD simulation, the Kriging model was established. The credibility of the model was verified and global optimization was carried out by optimization algorithm. The results show that the maximum drag coefficient of  the rectangular pit arrangement of the vehicle rear end is as 7.9%, which greatly improves its aerodynamic performance and provides non-smooth surface drag reduction and optimization with theoretical basis and reference.

Key words: pit non-smooth surface, tail airflow, drag reduction characteristic, optimization design