汽车车身基本气动造型的提取方法  

Extraction method of basic aerodynamic modeling of vehicle body

作　　者：龙韧[1] 朱文强 李珺 曹淮[1] LONG Ren;ZHU Wen-qiang;LI Jun;CAO Huai(School of Mechanical Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074;School of Industrial Design,Hubei University of Technology,Wuhan 430070)

机构地区：[1]华中科技大学机械科学与工程学院,湖北武汉430074 [2]湖北工业大学工业设计学院,湖北武汉430070

出　　处：《机械设计》2021年第11期115-120,共6页Journal of Machine Design

基　　金：湖北省大学生创新训练项目(S201910500098);华中科技大学校级教改项目(2019057)。

摘　　要：针对传统汽车车身气动性分析过程中非气动性部件和复杂曲面导致改进分析效率低、不利于发现整体气动性缺陷等问题,提出一种在改进分析前提取基本气动造型的方法。根据网格分布、流场影响及对非气动性细节的分析,完成整车基本气动造型的提取,提取后的整车车身简洁,且包含实车造型特征,能够更有效地进行气动性能分析。结合CFD计算流体力学仿真软件,对简化后的车型进行仿真分析,通过对气动升力系数、气动阻力系数与实车三维模型的气动性能分析结果进行对比,验证基本气动造型的可行性。该基本气动性造型提取方法提高了气动性分析和气动造型改进效率。Aiming at low efficiency and invisibility of aerodynamic performance defects during traditional aerodynamic analysis of vehicle body caused by non-aerodynamic components and complex surfaces, an extracting basic aerodynamic modeling method was proposed before improvement analysis. The basic aerodynamic modeling extraction of vehicle body was completed according to the analysis of mesh distribution, flow field and non-aerodynamic parts details. The extracted vehicle body was concise with real vehicle modeling features, which could perform aerodynamic analysis more effective. The simplified vehicle model was performed simulation analysis combined with CFD computational fluid dynamics simulation software. The feasibility of basic aerodynamic modeling was verified through the comparison of aerodynamic lift factor, aerodynamic resistance and other data between simplified vehicle simulation and actual vehicle analysis. This basic aerodynamic extraction method improved the efficiency of aerodynamic analysis and aerodynamic modeling improvement.

关 键 词：汽车外形设计 基本气动造型 数值模拟 空气动力学 外流场分析 

分 类 号：U462.1[机械工程—车辆工程] O355[交通运输工程—载运工具运用工程]