商用车发动机舱流场仿真与风罩优化设计  

Flow Field Simulation of Engine Compartment in a Commercial Vehicle and Design Optimization of Flow Guiding Shroud

作　　者：石岩 李耀 许佩佩 Shi Yan;Li Yao;Xu Peipei(Xuzhou Xugong Automobile Manufacturing Co.,Ltd.,Xuzhou 221600;Nanjing University of Aeronautics and Astronautics,Nanjing 210016In order to enhance the heat dissipation capacity of a commercial vehicle)

机构地区：[1]徐州徐工汽车制造有限公司技术中心,徐州221600 [2]南京航空航天大学民航/飞行学院,南京210016

出　　处：《汽车工程》2021年第8期1248-1253,共6页Automotive Engineering

基　　金：江苏省研究生科研与实践创新计划项目(KYCX20-0214)资助。

摘　　要：为提升某商用车最大转矩点工况下的散热能力,利用CFD技术对机舱流场特性和冷却性能进行了研究。通过仿真结果与风洞试验对比分析,验证了网格尺寸和模型的可靠性。针对散热器上部和左右侧出现的热风回流现象,在原机标配护风圈的基础上,增添了导流罩,并基于CFD技术结合试验设计对其结构参数进行优化,仿真结果显示,加装导流罩后热风回流量大幅降低,并伴随冷却风量稍有提升。最后进行热平衡道路试验。结果表明:最大转矩工况下,加装导流罩后许用极限环境温度提升3.4℃,验证了导流罩的有效性。In order to enhance the heat dissipation capacity of a commercial vehicle in maximum torque condition,the flow field characteristics and cooling performance of engine compartment are studied by using CFD technology.Though the comparison between the simulation results and wind tunnel test data,the mesh size and the reliability of model are verified.To tackle the reflux phenomenon of hot air occurring at the upper part and both sides of the radiator,a flow guiding shroud is added on the base of original fan guard,with its structural parameters opti⁃mized by using CFD technology combined with the design of experiments.The simulation results show that the in⁃verse flow of hot air is greatly reduced after the flow guiding shroud is added,with a minor rise of the flow rate of cooling air.Finally a validation road test for thermal balance is performed with a result indicating that with the low guiding shroud added,the allowable extreme ambient temperature is raised by 3.4℃,verifying the effectiveness of flow guiding shroud added.

关 键 词：发动机舱 CFD 风洞试验 热风回流 导流罩 

分 类 号：U464[机械工程—车辆工程]