汽车热管理系统共轭换热仿真  

Simulation of Conjugate Heat Transfer for Vehicle Thermal Management System

作　　者：肖国权[1,2] 杨志刚[1] 张万平[1] 

机构地区：[1]同济大学汽车学院,上海201804 [2]华南理工大学机械与汽车工程学院,广州510640

出　　处：《系统仿真学报》2010年第7期1733-1736,共4页Journal of System Simulation

摘　　要：为考虑各部件间及相应物理场间的耦合关系,建立包含发动机尾气、排气管道及后处理设备的某轿车整车辐射与内外流固共轭换热模型,将流体与固体之间复杂的外边界条件变成相对简单的内边界。采用STAR-CD软件,选用高雷诺数的k-ε两方程湍流模型和标准壁面函数及共轭换热和DO辐射换热模型对轿车的热环境状况进行了三维稳态模拟,给出了发动机舱和排气系统及部件的温度分布情况,对比分析了排气系统各部件表面的平均温度和最高温度。结果表明:怠速工况下排气系统及底盘的热环境情况最为恶劣;满载爬坡工况发动机舱的热环境情况最为恶劣。A radiation and fluid-solid conjugate heat transfer model,which includes the exhaust gas,the exhaust pipes and aftertreatment devices,was established to study the vehicle thermal management systems.In this model,the complicated boundary conditions between fluid and solid,which need to be specified in the non-coupled models,are now part of the solution and do not need to be specified.A three-dimensional steady-state analysis was undertaken for the heat transfer characteristics of this vehicle thermal system at three thermally-critical vehicle operation conditions using the High-Reynolds formulation of the k-epsilon turbulence model with standard wall function and the conjugate heat transfer with the DO model for the radiation heat transfer.The resulting temperature characteristics for the vehicle underhood and the vehicle underbody show that the underbody thermal environment should be noted especially at vehicle idle condition;and the operating condition for the vehicle climbing uphill with full load is critical for the vehicle underhood thermal environment.

关 键 词：热管理 流固耦合 辐射 共轭换热 

分 类 号：U467[机械工程—车辆工程]