基于CFD的某商用车发动机舱的改进设计  

Improved design of engine compartment for a commercial vehicle based on CFD

作　　者：王露阳 王良模[1] 邹小俊[2] 谢桃新[2] 张汤赟[2] WANG Luyang;WANG Liangmo;ZOU Xiaojun;XIE Taoxin;ZHANG Tangyun(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing,Jiangsu 210094,China;Nanjing IVECO Automobile Co.,Ltd.,Nanjing,Jiangsu 210028,China)

机构地区：[1]南京理工大学机械工程学院,江苏南京210094 [2]南京依维柯汽车有限公司,江苏南京210028

出　　处：《江苏大学学报（自然科学版）》2018年第5期517-522,共6页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省产学研联合创新资金-前瞻性联合研究项目(BY2014004-04)

摘　　要：为解决某商用车在夏季高温怠速工况下冷凝器温度偏高以及发动机舱整体热环境较差的问题,在有限元软件中,采用多孔介质模型和多重参考坐标系法简化换热器和风扇,建立了可用于热分析的CFD模型.运用CFD分析软件对发动机舱内流场与温度场的分布进行了数值模拟,同时考虑了热对流、热辐射对发动机舱热环境的影响.根据流场与温度场的仿真结果,确定机舱中热回流的位置以及形成发动机舱内的高温热害的原因,结合整个发动机舱的布局和考虑开发成本,提出了在冷凝器侧边增加阻流板以及冷凝器下端增加导流板的改进方案,并对改进方案进行仿真验证.结果表明:增加阻流板和导流板的改进方案可以有效减轻热回流现象,明显改善了发动机的散热环境.To solve the problems of a commercial vehicle with high temperature in condenser and poor thermal environment in engine compartment under idle condition in summer,the porous media model and the multiple reference frame were respectively used to simplify heat exchangers and fan,and the computational fluid dynamics(CFD)model for thermal analysis of engine compartment was established in the finite element software.The CFD software was used to simulate the distribution of flow field and temperature field in engine compartment.The effects of thermal convection and thermal radiation on thermal environment of engine compartment were also considered.According to the flow field and temperature field distribution,the location of heat reflux in engine compartment and the cause of high temperature in heat damage area were determined.Considering the layout and the development cost of entire engine compartment,an improved scheme of adding a spoiler on the condenser side and a deflector at the bottom of condenser was proposed,and the improved scheme was verified by simulation.The simulation results show that the heat reflux is effectively reduced,and the engine compartment thermal environment is significantly improved by adding spoiler and deflector.

关 键 词：发动机舱 计算流体动力学 流场 温度场 改进设计 

分 类 号：U464[机械工程—车辆工程]