Experimental Research and Simulation Analysis of IGBT Water-cooled Radiator

The water-cooled radiator is an effective heat dissipation device to ensure that the high-power AC drive electric locomotive's converter device works properly,the heat dissipation performance and flow resistance has always been a research focus topic. Due to the low flow velocity in water-cooled radiators,the Reynolds number is between laminar and turbulent flow,it is very difficult to determinate the state of internal flow. In order to solve this problem,two schemes of the IGBT water-cooled radiator for high-power AC drive electric locomotive's converter device are studied.Loss characteristics and junction temperature influence each other so the IGBT device cannot work in extreme conditions for a long time. Therefore,a man-made simulated heat source is used to replace the IGBT device in the experiment.The influence of laminar model,standard k- e model and 6 different low Reynolds number turbulence models( Abid,Lan-Bremhorst,Launder Shorma,Yang-Shih,Abe-Kondoh-Nagano,Chang-Hsich-Chen) on the simulation results were discussed. The comparison of simulation results and experimental data show that: laminar model and standard k-e model can represent the upper and lower results of temperature and pressure drop,Lan-Bremhorst low Reynolds turbulence model is coincident with the experimental data of temperature and pressure drop,the rest of the 5 kinds of low Reynolds number turbulence models are basically close to the standard k- e model.