电动汽车变流器用IGBT水冷散热器热仿真分析

来源期刊:中南大学学报(自然科学版)2017年第2期

论文作者:丁杰 张平

文章页码:525 - 533

关键词:电动汽车;变流器;IGBT;水冷散热器;模型降阶;瞬态计算

Key words:electric vehicle; converter; IGBT; water-cooling radiator; model order reduction; transient calculation

摘    要:以某电动汽车变流器用IGBT水冷散热器为研究对象,考虑到IGBT水冷散热器内部各槽道平均雷诺数(Re)处于过渡区,利用FLUENT软件分别采用层流、标准k-e湍流模型和6种低Re数湍流模型计算IGBT水冷散热器的稳态结果。运用自主开发的模型降阶计算程序对IGBT水冷散热器进行瞬态问题快速计算,在验证模型降阶方法准确性的基础上,对基于中国典型城市道路工况的瞬态热仿真进行快速计算,得到IGBT元件各芯片在不同时刻的温度变化曲线。研究结果表明:该水冷散热器的散热性能满足中国典型城市道路工况的需求。

Abstract: An IGBT water cooling radiator used in an electric vehicle converter was studied. Considering that the average Reynolds number of each channel was in the transition region, steady state temperature of the radiator was calculated by using the laminar model, the standard k-e turbulence model and six kinds of different low Reynolds number turbulence models with FLUENT software, respectively. Transient problem of the radiator was calculated by using self-developed model order reduction calculation program. Through verifying the accuracy of model order reduction method, transient thermal simulation of typical Chinese urban road conditions was carried out to obtain the temperature variation curves of each chip in IGBT device at different time. The results show that the heat dissipating performance of the water cooling radiator can meet the demand of typical Chinese urban road conditions.

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