电池组布置对电动汽车气动性的影响

Study of aerodynamic characteristics of electric vehicles with battery pack

布置在电动汽车底部的电池组由于体积庞大,安装位置受限,突出于汽车底部,给电动汽车的气动性带来了很大影响。针对这种影响,以简化的电动汽车模型为研究对象,利用Fluent软件对影响的大小及产生的原因进行仿真分析。结果表明:增加电池组后,原车模型的阻力系数增加了35.6%,升力系数增加了286.6%;随着电池组最小离地间隙的增加,阻力系数和升力系数都随之减小,但升力系数减小的更多。仿真分析结果可为电动汽车电池组布置提供参考。

Battery pack arranged in the underbody generally protrudes from the bottom of the car due to the huge volume and the limited space,which brings about great impact on aerodynamic characteristic of electric car. In view of the influences,the effect and reasons of a simplified electric car are analyzed with software Fluent. Results show that the drag coefficient of electric vehicles increases by 35. 6%,and lift coefficient increases by 286. 6% after considering the battery pack; With the increase of battery pack minimum ground clearance,drag coefficient and lift coefficient are reduced,lift coefficient decreasing amplitude is bigger. Analysis of the results can provide reference for battery pack arrangement.