无接触网供电车辆电磁-热场耦合计算

无接触网供电技术在城市轨道交通中的应用受到越来越广泛的关注，大功率无接触电能传输的实际应用还有许多问题需要论证，其中电磁感应导致的涡流发热问题引起人们的普遍重视. 依据电磁感应原理和传热学，建立无接触网供电车辆感应加热模型，采用有限元法计算无接触网供电车辆热场分布，对不同载荷工况下的车辆的发热情况进行数值仿真，并对采用散热器和风冷两种散热方式的接收线圈的散热性能进行对比研究. 研究结果表明:接收线圈和转向架温度升高明显；随着发射线圈电流增加以及气隙距离的减小，车辆各个部位的温度都有上升趋势；装有散热器的接收线圈最高温度比不含散热器时降低了126.0 ℃，通过改变散热器的传热系数能进一步提高散热器的散热性能；采用风冷散热方式接收线圈温度降低了131.2 ℃，与散热器相比，风冷的散热性能略好，且随着风速增加风冷效果更加突出. 

Electromagnetic-Thermal Field Coupling Calculation of Contactless Power Transfer Vehicle

The application of contactless power transfer technology in urban rail transit has attracted more and more attention. However, there are still many problems to be addressed in the practical application of high-power contactless network power supply technology, among which the eddy current heating problem caused by electromagnetic induction is one of major concerns. In this work, an electromagnetic induction heating model of contactless power transfer vehicle is established according to the electromagnetic induction principle and the heat transfer theory. Using the finite element method, the thermal field distribution of the contactless power transfer vehicle is calculated, and numerical simulations of vehicle heating under different load conditions are performed. In addition, the heat dissipation performance of the receiving coils with radiator and air cooling is compared. Results show that the temperatures of both the receiving coils and bogie rise significantly. As the current of the transmitting coils increases and the distance of the air gap decreases, the temperature of each part of the vehicle has an upward trend. The maximum temperature of the receiving coils with the radiator is 126 ℃ lower than that without the radiator, and the performance of the radiator can be further improved by changing its heat transfer coefficient. Meanwhile, the temperature of the receiving coils with air cooling is reduced by 131.2 ℃. Compared with the radiator, the air-cooling heat dissipation performance is slightly better, and the air-cooling effect is more prominent as the wind speed increases.