基于风洞试验与CFD分析的汽车前后轴气动升力计算的研究  

A Research on Vehicle Aerodynamic Lift Calculation of Front and Rear Axles Based on Wind Tunnel Test and CFD Analysis

作　　者：张勇[1,2] 谷正气[1,2] 刘水长[2] 米承继[2] 

机构地区：[1]湖南大学,汽车车身先进设计制造国家重点实验室,长沙410082 [2]湖南工业大学机械工程学院,株洲412007

出　　处：《汽车工程》2017年第3期275-280,共6页Automotive Engineering

基　　金：湖南省自然科学基金(2017JJ2074);湖南省教育厅高等学校科学研究计划项目(15B066);中央财政创新团队项目(0420036017)资助

摘　　要：本文中基于HD-2风洞耦合CFD分析,研究分别求取汽车前、后两轴气动升力系数的方法。首先进行HD-2风洞缩比模型测力试验,测得总的气动阻力和气动升力。接着通过力学分析,根据六分力力系平衡方程,推导出前后两轴升力系数计算公式,提出基于HD-2风洞耦合CFD分析的汽车前后轴气动升力系数求解流程;在此基础上,进行了基于LBM粒子法的外流场CFD数值仿真,再将仿真得到的气动阻力、升力和侧倾力矩代入系数计算公式,求得前后轴仿真计算升力系数,并与基于试验测得升力的计算结果进行对比。本研究为汽车车身造型优化提供了参考。A scheme for solving the lift coefficients of front and rear axles separately based on HD-2 wind tunnel test coupled with CFD analysis is studied in this paper. Firstly a force measurement test for scaled model is conducted in HD-2 wind tunnel to obtain overall drag and lift forces. Then by mechanism analysis based on the bal-ance equations of six-component force system,the calculation formulae for the lift coefficients of front and rear axles are derived,with a corresponding flow chart proposed. On this basis, a CDF numerical simulation on the exterior flow field around vehicle is performed based on Lattice Boltzmann method, with the simulation results of aerodynam-ic drag,lift force and roll moment substituted into calculation formulae to obtain the simulated lift coefficients of front and rear axles,which are then compared with those based on measured aerodynamic forces. The study provides references for the styling optimization of vehicle body.

关 键 词：汽车气动升力 前后轴 风洞试验 CFD分析 

分 类 号：U461.1[机械工程—车辆工程]