高速列车IGBT干冰微粒喷射散热器仿真模拟

Simulation on heat sink with dry ice particle injection for IGBT of high-speed train

针对高速列车牵引变流器IGBT模块的高效冷却需求,提出利用自然工质干冰微粒喷射冷却方法,设计干冰微粒喷射散热器,建立流动与传热模型,模拟仿真不同散热器针柱结构参数下换热基板的温度场和速度场。结果表明:提高干冰微粒喷射冷却能力主要在于提高干冰微粒升华相变潜热利用率。干冰微粒流体速度为1 m/s,进口干冰体积分数为0.5,针柱数量为8×8,高度为45 mm,直径为12 mm,可实现6500 V/750 A的高功率IGBT模块的良好冷却。干冰微粒喷射冷却与水冷相比,换热基板温度更均匀,冷却效果更好。

Aiming at the high efficiency cooling requirement of IGBT module of high-speed train traction converter,a dry ice particle injection cooling method using natural working medium was proposed to design a dry ice particle injection heat sink,a flow and heat transfer model was established to simulate the temperature field and velocity field of heat exchange substrate under different heat sink needle structure parameters.It is concluded that the main factor to improve the injection cooling capacity of dry ice particle is to improve the utilization rate of latent heat of sublimation phase transformation of dry ice particle.The fluid velocity of dry ice particle is 1 m/s,the volume fraction of imported dry ice is 0.5,the number of needle is 8×8,the height is 45 mm,and the diameter is 12 mm,which can achieve good cooling of 6500 V/750 A high-power IGBT module.Compared with water cooling,the temperature of the heat exchange substrate is more uniform and the cooling effect is better.