Research Of Temperature Field Characteristic Of Equipment Cabin For High-cold EMU

In recent years,with the development of high-speed train technology in our country,the operating speed of high-speed trains is also getting higher and higher. The traction system.including the traction motor, traction transformers, traction converters, auxiliary converters and other equipments, is one of the main parts of the high-speed train. And as the main equipments of the traction system, these train equipments are installed in the train cabin. These devices will generate a lot of heat during operation. Because the arrangement of the equipments is more modular, more compact,the important of cooling is becoming more and more important. If the impact of the layout of various components to the air stream in the equipment cabin is not considered fully, it may promote the formation of "dead zone" in local flow, causing high temperature in the whole or partial equipment cabin, affecting the performance of each device. And it may affect the normal operation of the train if this effect is more seriously. Because china has a broard territory and the train’s operational environment is complex and mutative, the test and numerical analysis of the heating equipments’surface temperature is becoming more and more important.In the beginning,this article drawn from the analysis of the experimental data.The results show that traction converters,traction transformers,the single auxiliary converter and dual auxiliary converter’s surface temperature show cyclical changes, and have some relevance to the environment temperature. Then, based on the three-dimensional unsteady compressible Navier-Stokes equations and the standard k-ε turbulence model, we establish three-dimensional aerodynamic models of high-cold EMU on the open line and the calculation model of internal flow in equipment cabin,of which there are four carriages.Using the coupling between the train’s outer flow and equipment cabin’s internal flow,we research on high-cold EMU in the condition that its speed is350km/h,the environment temperature is26℃. From the calculation,we have drawed the distribution of equipment’s surface temperature and the velocity distribution of air flow in the surface area of EMU and in the equipment cabin.The temperature of front and side surfaces of the heating equipment is higher than the other surface’s temperature.At last,we compare the data of numerical simulation with the test data.The numerical analysis are in good agreement with the test data.The numerical analysis is accurate and reliable.