【作者】 胡兴军； 马鹏展； 和生泰； 周申申； 王坤阳； 齐胜业； 杨博；

【Author】 Hu Xingjun;Ma Pengzhan;He Shengtai;Zhou Shenshen;Wang Kun-yang;Qi Shengye;Yang Bo;State Key Laboratory of Automotive Simulation and Control,Jilin University;

【机构】 吉林大学汽车仿真与控制国家重点实验室；

【摘要】 为探究底盘设计变量对整车气动特性的影响,本文首先基于风洞试验验证了CAS模型外流场仿真策略正确性,然后基于平台化和模块化思想,对CAS模型的底盘进行了参数化设计,采用CFD数值模拟方法,分析了同平台下不同后悬架形式及轴距对整车气动特性的影响。研究结果表明:装配有扭力梁式非独立悬架的B_B模型相比于独立悬架的B_A模型气动阻力系数增加了3.9%;在车身长度一定时,长轴距A3模型相比于短轴距A1模型气动阻力系数增加2.5%。此外,悬架形式和轴距对底盘和车身气动阻力占比均有较大影响。研究内容对整车前期开发阶段悬架和轴距的选型提供了参考依据。更多还原

【Abstract】 In order to explore the impact of chassis variables on the aerodynamic characteristics of the automobile,this paper first validated the exactness of the simulation strategy of the CAS external flow field through wind tunnel tests,and then parameterized the chassis of the CAS model based on the idea of platform and modularization,The CFD numerical simulation method was used to analyze the influence of different rear suspension forms and wheelbase on the aerodynamic characteristics of the automobile under the same platform.The results show that the B_B model equipped with torsion beam type dependent suspension increase by 3.9% in the aerodynamic drag coefficient compared to the B_A model with independent suspension.When the body length is constant,the aerodynamic drag coefficient increases 2.5% for the long wheelbase A3 model compared to the short wheelbase A1 model;in addition,the suspension form and wheelbase have a great influence on the aerodynamic drag ratio of the chassis and body.The content of the study improves the selection of the suspension and wheelbase for the early development stage of the automobile.更多还原