某型SUV乘用车冷却系统性能仿真与优化

Simulation and optimization on cooling system performance of SUV passenger car

为解决某型SUV乘用车在中、低速爬坡和高速行驶工况下发动机水温过高的问题,利用一维和三维联合仿真工具建立整车冷却系统的仿真模型,采用试验与仿真相结合的方法,分析单回路和双回路冷却系统、不同冷却管路布置、不同散热器选型,以及不同前端冷却模块结构等对冷却系统热平衡性能的影响。结果表明:变速箱和发动机相互独立的双回路冷却系统可以明显降低发动机的出水温度;冷却系统管路的布置对冷却液流量分配有一定影响,但对冷却液温度影响较小;通过散热器优化选型并改进机舱前端冷却模块的结构,可以改善机舱流场特性,增大冷却系统的进风量,进而提升冷却系统的散热性能。

To solve the problem that the engine water temperature of an SUV passenger vehicle is too high when climbing at medium and low speed and driving at high speed,the simulation model of vehicle cooling system is established using 1D and 3D co-simulation.Combining test and simulation,the effects of single loop and double loop cooling system,different cooling pipeline layout,different radiator selection,and different front cooling module structure on the heat balance performance of the cooling system are analyzed.The results show that the double loop cooling system with independent transmission and engine can significantly reduce the water outlet temperature of the engine;the layout of the cooling system pipeline has a certain impact on the coolant flow distribution,but has little impact on the coolant temperature;optimizing the radiator selection and improving the structure of the front cooling module of the engine room,the flow field characteristics of the engine room can be improved,and the inlet air volume of the cooling system can be increased,and then the heat dissipation performance of the cooling system can be improved.