Abstract: To reduce wind resistance and energy consumption, and to verify the feasibility of computational fluid dynamics (CFD) technology in engineering development, this paper takes a sedan as the object and uses CFD simulation technology to optimize the aerodynamic kits such as the front and rear wheel wind deflectors, rear wing, wheel cover, active grille shutter (AGS), grille opening, underbody shield, battery side shield, and exterior mirrors. At the same time, based on the simulation results, a limited number of schemes are selected for wind tunnel tests for verification. Ultimately, the wind resistance coefficient test result is 0.227, which is 44 counts lower than the original state, achieving a significant reduction in wind resistance.

Key words: aerodynamics; CFD; wind resistance coefficient; wind tunnel test

摘要： 为降低风阻和能耗，并验证计算流体动力学（CFD）技术在工程开发中的可行性，文 章以某三厢轿车为对象，通过 CFD 仿真技术，分别对前后轮阻风板、尾翼、轮辋盖板、主动 进气格栅（AGS）、格栅开口、底护板、电池包侧护板、外后视镜等气动套件进行风阻优化。 同时，以仿真结果为基础，选取有限的方案进行风洞试验验证。最终得出，风阻系数测试结 果为 0.227，较原状态风阻系数下降了 44 counts，实现了较大程度的降阻。

关键词: 空气动力学；CFD；风阻系数；风洞试验