基于CFD与ε-NTU法的工程车辆散热性能预估  

Forecast calculation of heat exchange capacity in construction vehicles based on CFD and ε-NTU

作　　者：刘佳鑫[1,2] 蒋炎坤[1] 秦四成[3] 刘成强[1] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074 [2]华北理工大学机械工程学院,河北唐山063009 [3]吉林大学机械科学与工程学院,吉林长春130025

出　　处：《华中科技大学学报（自然科学版）》2016年第8期6-10,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家科技支撑计划资助项目(2013BAF07B04);江苏省科技支撑计划(工业)资助项目(BE2012041);内燃机燃烧学国家重点实验室开放研究资助项目(K2012-08)

摘　　要：为提高车辆散热系统选型设计效率,了解车辆散热系统工作性能,采用CFD数值模拟对散热器单元体进行分析,提取所需参数拟合性能曲线;将散热器压力损失转换为三维模型参数,在虚拟风洞内进行数值模拟,获得动力舱进风系数;将所得参数代入ε-NTU中求解,对车辆动力舱内实际散热性能进行预估.选用两种较为常见的车辆散热系统作为实例进行验算,将计算结果分别与三维CFD模拟仿真结果和实验数据相对照,结果表明:温度数值的最大误差出现在中冷器,约为7.89%,其余热介质平均误差约为2.29%,在可接受范围之内;该预估方法计算精度略低于三维CFD仿真,但计算周期短、扩展性强、相对简单、更为实用,更适用于散热系统选型及车辆动力舱内实际散热性能的预估.In order to improve efficiency of system match and design and acknowledge heat exchange capacity in construction vehicles,an elementary unit of radiator was built to be simulated using CFD（computational fluid dynamics）numerical method,and performance curves were fitted based on the data extracted from the simulation.Pressure loss data of the radiator was converted into parameters in three-dimensional model for further acquiring entrance coefficient of the engine cabin.Theε-NTU model was solved with the needed data to obtain the practical heat capacity in engine cabin.Two kinds of widely used construction vehicles were selected to demonstrate the forecast calculation,after comparing between calculation results,three dimensional simulation results and experiment data.It is found that the maximum temperature error is 7.89% which appears in CAC（charge air cooler）,and the mean error of other thermal medium is 2.29%.The discrepancy is acceptable.Computational accuracy of this calculation is lower,however,it has many advantages such as short period and excellent expansibility,and it is relatively simply and more practical,which can be used to predict actual heat exchange performance and system selection.

关 键 词：工程车辆 散热性能 CFD分析 数值模拟 预估方法 

分 类 号：U415.52[交通运输工程—道路与铁道工程]