基于CFD与ε-NTU法的工程车辆散热性能预估

发布时间：2018-02-28 03:22

本文关键词： 工程车辆散热性能 CFD分析数值模拟预估方法　出处：《华中科技大学学报(自然科学版)》2016年08期 　论文类型：期刊论文

【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.
[Abstract]:In order to improve the efficiency of vehicle heat dissipation system selection and design and to understand the working performance of vehicle heat dissipation system, the CFD numerical simulation was used to analyze the radiator unit, and the required parameters fitting performance curve was extracted. The pressure loss of the radiator is converted into three dimensional model parameters, and the numerical simulation is carried out in the virtual wind tunnel to obtain the intake coefficient of the power cabin, and the obtained parameters are replaced in 蔚 -NTU to solve the problem. The actual heat dissipation performance in the vehicle power cabin is estimated. Two common vehicle heat dissipation systems are selected as examples to check and calculate, and the calculated results are compared with the results of 3D CFD simulation and experimental data, respectively. The results show that the maximum error of the temperature value appears in the intercooler, which is about 7.89, and the average error of the other thermal media is about 2.29, which is within the acceptable range. The accuracy of this method is slightly lower than that of the three-dimensional CFD simulation, but the calculation period is short and the expansibility is strong. It is relatively simple, more practical, more suitable for the heat dissipation system selection and the actual heat dissipation performance prediction in the vehicle power cabin.
【作者单位】：华中科技大学能源与动力工程学院;华北理工大学机械工程学院;吉林大学机械科学与工程学院;
【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)
【分类号】：TU603;U469.6

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