晶闸管水冷散热器的热仿真与实验

Thermal Analysis and Test of Water-Cooled Radiator for Thyristor

为协调散热性能与流动阻力的矛盾关系,开发了一款基于阿基米德螺旋流道结构的晶闸管水冷散热器。分别利用Hyper Mesh和FLUENT软件划分高质量网格与求解计算,得到了流速分布与温度场分布,可以看出冷却水在水冷散热器中间部位出现流速不均,导致中心部位的温度最高。通过分析冷却水流量、温度和发热量等因素对温升与压降的影响可知:入口流量不变时,温升随发热量增大而提高;发热量不变时,温升随入口流量增大而降低,流量增大至一定程度,温升受入口流量的影响很小;入口流量不变时,温升随冷却水温度升高略有下降;压降随入口流量增大而急剧上升;压降随冷却水温度提高而小幅度下降。建立了样品测试环境,测量了不同入口流量下的试验数据,对比分析可知仿真结果的准确性。对水冷散热器中间部位的流道进行改进后,最高温度降低了7.8%。

Thermal Analysis and Test of Water-Cooled Radiator for Thyristor DING Jie, ZHANG Ping （1.College of Civil Engineering and Mechanics, Xiangtan University, Hunan Xiangtan 411105, China;2.CSR Research of Electrical Technology ＆ Material Engineering, CSR Zhuzhou Institute Co., Ltd., Hunan Zhuzhou 412001, China） Abstract ：In order to solve the contradiction between heat transfer performanee and flow resistance, a water-cooled radiator of thyristor based on Archimedes spiral flow channel structure had been developed. High quality mesh model was generated and then calculated by using HyperMesh and FLUENT software respectively, the velocity field and temperature field distribution were obtained. It can see that the velocity of cooling water does not uniform in the middle part of the water-cooled radiator, which causes the temperature of the centre part being highest. According to the analysis of the cooling water flow rate, temperature and thermal power on temperature rise and pressure drop, it indicates that： temperature rise increases with thermal power in constant flow rate condition, temperature rise decreases with flow rate in constant thermal power condition, temperature rise affected by flow rate is very small when flow rate increases to some extent, temperature rise increases with cooling water temperature slightly in constant flow rate, pressure drop increases with flow rate sharply, pressure drop decreases a little with the increase of cooling water temperature. The test environment is set up and the test data of different entrance flow is measured, the accuracy of simulation results can be verified by test data. According to improving the middle part of the radiator channel, the highest temperature is reduced by 7.8%.