周荣良1，毛洪海2，严江2，闫伟1

1.山东大学能源与动力工程学院，山东济南250061；2.潍柴动力股份有限公司，山东潍坊261001

摘要：基于计算流体动力学（computational fluid dynamics，CFD）模拟仿真与热平衡试验，对某轻型卡车的整车温度场进行分析，发现蓄电池、排气歧管与涡轮增压器附近线束的表面温度较高，出现热害现象。根据热害发生位置，对高温部件使用隔热罩削弱热辐射，使蓄电池与线束在热浸状态与发动机最大扭矩（转速为1300 r/min）工况下，温度始终低于其许用最高温度，避免零部件的高温失效甚至自燃；并根据隔热罩厚度与隔热效果的关系，在不影响隔热效果的同时，降低隔热罩厚度，实现轻量化设计。

关键词：热害；发动机舱；底盘；CFD分析

Abstract:Based on CFD simulation and heat balance experiment, the temperature field of a light truck is analyzed, and it is found that the surface temperature of the wire harness near the battery, exhaust manifold and turbocharger is higher, resulting in thermal damage. According to the location of the heat damage, the thermal radiation of the high temperature parts is weakened by using the heat shield, so that the temperature of the battery and wire harness is always lower than the allowable maximum temperature under the hot immersion state and the maximum engine torque (engine speed 1300 r/min) condition, so as to avoid the high temperature failure or even spontaneous combustion of the parts. According to the relationship between the thickness of the heat insulation cover and the heat insulation effect, the thickness of the heat insulation cover is reduced and the lightweight design of the automobile is realized without affecting the heat insulation effect.

Keywords: heat damage; engine compartment; chassis; CFD analysis