电动大巴逆变器用管式冷板传热性能研究

Heat Transfer Research on Tube Cold Plate for an Inverter Used in the Electrical Bus

研究电动大巴逆变器用冷板的流道结构问题,针对平板式S型流道冷板均温性差、易泄露,影响元器件寿命及逆变器系统工作的稳定性等问题,设计了一款改进S型流道压管式冷板散热器。根据传热理论采用有限元软件ICEPAK建立了逆变器系统散热的各冷却流道冷板物理模型,对U型与S型流道冷板的温度场分布和流道压降进行模拟仿真,对比分析了改进S型流道冷板的均温性能和流道压降。仿真结果表明:在相同的进口流量和进口温度下,改进S型流道冷板温度分布更加均匀且流道压降相对较小。在此基础上,对流道进口流量进行进一步优化得到最优流量参数。最后试制样机,仿真和试验结果验证了改进S型流道冷板具有较好的流动换热综合性能。

For the bad temperature uniformity and leakage of plate type water - cold radiator, which make effect on components service life and inverter working stability, a new S - shaped channel tube cold plate on the basis of study on flow channel structure is designed for electrical bus in this paper. Based on the theory of heat transfer, the simulation model of different water - cooling flow channel is established by the finite element software ICEPAK. The temperature field and pressure drop of U - shaped and S - shaped channel cold plates are simulated and compared with the new S -shaped channel cold plate. The results indicate that the new S -shaped channel cold plate has bet- ter temperature uniformity and lower pressure drop under conditions of the same inlet flow and the same temperature. The inlet flow rate is designed with the final optimal parameters. The comparison results of simulation and experiment indicate that the new cold plate has the best flow and thermal performance in cooling by prototype testing.