【作者】 齐胜业； 王靖宇； 胡兴军； 丁九洋； 杨博；

【Author】 QI Sheng-ye;WANG Jing-yu;HU Xing-jun;DING Jiu-yang;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】 为了深入探索同平台下轴距可调对车辆气动特性的影响。本文在同平台的思想上,基于"模块化"平台设计理念,以近似优化方法和CFD数值模拟为研究手段,以流线型系数作为气动性能评价指标,进行了光滑底盘CAS模型的气动外形优化研究。结果表明:轴距对车辆气动性能有影响,在车身增长的情况下,气动阻力总体呈上升趋势,气动性能减弱;另外,当车身和轴距同时变化时,长车身模型气动性能较优;而车身长度不变、仅轴距改变时,短轴距模型表现出较好的气动性能。与原模型相比,光滑长轴距模型气动阻力值下降0.025。该项研究能为新车型开发过程中轴距的设计提供数据参考。更多还原

【Abstract】 in order to deeply explore the influence of adjustable wheelbase to the aerodynamic characteristics of the vehicle under the same platform..Based on the thought of the same platform and the modular platform design concept,The aerodynamic shape optimization of the smooth chassis CAS model is studied by using the approximate optimization method and the CFD numerical simulation as the research method,and the streamline coefficient as the aerodynamic performance evaluation index.The results show that the wheelbase has an influence on the aerodynamic performance of the vehicle,and the aerodynamic drag tends to rise as the length of the body grows,and the aerodynamic performance is weakened;In addition,when the body and wheelbase change simultaneously,the aerodynamic performance of the long body model is better;When the body length is constant and the wheelbase changes,the short wheelbase model shows better aerodynamic performance.Compared with the original model,the aerodynamic drag coefficient of the long wheelbase model is decreased by 0.025.The research can provide data reference for wheelbase design in the development of new car type.更多还原