汽车进气格栅角度与冷却风扇转速的匹配研究

A Study on the Matching of Air Inlet Grille Angle and Cooling Fan Speed in a Car

汽车冷却系统前端进气量直接影响发动机舱的散热性能和气动阻力。针对某安装主动进气格栅(AGS)的乘用车在高速与低速行驶工况下,发动机存在过度冷却与过热等问题,采用计算流体力学(CFD)方法,分析了不同工况下,格栅进气角度与风扇转速对前发动机舱流场的影响;建立了格栅角度与风扇转速优化匹配的准则与方案,并通过匹配实例仿真和实车实验,对匹配方案的实际效果进行验证,结果表明,该进气模块匹配方案能满足极限工况下的散热需求,百公里油耗降低0.166 L。

The front-end intake air volume of vehicle cooling system directly affects the heat dissipation performance and aerodynamic resistance of engine compartment.In view of the overcool and overheat of engine under the high-speed and lower-speed conditions of the passenger car with active grille shutter(AGS),computational fluid dynamics(CFD)technique is adopted to analyze the effects of AGS angle and fan speed on the flow field of engine compartment.The optimization matching criteria and scheme of grille angle and fan speed are established and the real effects of matching scheme are verified by the simulation on a real example.The results show that the matching scheme of air intake module proposed can meet the requirements of heat dissipation under extreme conditions with a fuel consumption reduced by 0.166 L/100km.