某商用车发动机舱冷却模块布局优化

Layout optimization of cooling modules in a commercial vehicle engine compartment

为了改善某商用车发动机出水温度和整车风阻,提出了一种对发动机前舱冷却模块位置参数化研究方法。联合一维和三维计算平台建立了样车发动机舱计算模型,基于计算模型对以发动机舱内中冷器、散热器、冷却风扇和发动机本体之间距离为优化变量的四因素四水平正交试验进行发动机出水温度和整车风阻因数计算,利用极差法对正交试验结果进行分析得到各因素、各水平对发动机冷却效果和机舱气动阻力影响主次关系,从而确定最优组合方案。结果表明:最优方案相比原始发动机出水温度下降了2.3℃,比原始风阻因数降低了9.03,该优化方法能有效降低发动机出水温度和整车风阻。

A method for parameterizing the position of the cooling module in the engine front compartment was proposed to improve the water temperature of a commercial vehicle engine and the wind resistance of the whole vehicle.Combined with the 1 D/3 D computing platform,a calculation model of the engine compartment of the prototype vehicle was established.Based on the calculation model,a four-factor and four-level orthogonal test with the distance between the intercooler,the radiator,the cooling fan and the engine body in the engine compartment was used as the optimization variable.The engine outlet water temperature and the wind resistance coefficient of the whole vehicle are calculated,and the orthogonal test results were analyzed by the range method to obtain the primary and secondary relationship of each factor and level on the engine cooling effect and aerodynamic resistance,so as to determine the optimal combination scheme.The results show that the optimal solution is 2.3℃lower than the original engine outlet water temperature,and 9.03 counts lower than the original wind resistance coefficient.Therefore,this optimization method can effectively reduce the engine outlet water temperature and the wind resistance of the whole vehicle.