格栅对汽车前端进气影响的仿真分析  

Simulation and analysis on effect of grille on automotive front-end airflow

作　　者：王东[1] 樊登云 易吉云[1] 

机构地区：[1]同济大学汽车学院,上海201804

出　　处：《计算机辅助工程》2013年第6期18-22,36,共6页Computer Aided Engineering

摘　　要：为评估格栅各部分的进气能力和效率,利用三维CFD软件对某汽车在不同车速及不同格栅开启状态下分别进行仿真,分析冷却空气流量和空气阻力因数的变化.结果表明:流经冷凝器的质量流量随车速提高而增大,并呈现一定的不均匀性;上部格栅对进气量贡献较小,下部格栅影响较大,中部格栅进气效率最高;空气阻力因数随格栅关闭而减小,全部关闭时空气阻力因数较格栅全开时降低4.7%,能有效降低空气阻力.To evaluate the airflow capacity and efficient, the automotive models with different grille opening states at different automotive velocities are simulated by 3D CFD software, and the cooling airflow rate and aerodynamic drag factor are analyzed. The results show that, the mass flow rate through the condenser is inhomogeneous and increases with the improvement of vehicle velocity; the upper grille has little contribution to airflow while the contribution of lower grille is greater and the airflow efficient of middle grille is maximum ; the aerodynamic drag factor decreases when the grille is closed ; compared with the aerodynamic drag factor of fully opened grilles it reduces by 4.7% when all of the grilles are closed, which decrease the aerodynamic drag factor effectively.

关 键 词：格栅 质量流量 进气效率 空气阻力因数 

分 类 号：U464.134[机械工程—车辆工程]