低真空管道磁悬浮列车热效应仿真分析研究

Simulation Analysis and Research on Thermal Effect of Maglev Train in Low Vacuum Tube

为解决不同制式磁悬浮列车在低真空管道中运行的热效应仿真问题,更好地对磁悬浮列车在管道中运行产生的热效应危害进行预测防护,以磁悬浮列车通过长直低真空管道为例,在不影响仿真结果的基础上,基于仿真软件FLUENT建立低真空管道磁悬浮列车热效应计算的简化物理模型和数值模型,研究不同列车运行速度、管道真空度、阻塞比对低真空管道磁悬浮列车热效应的影响。计算结果表明:在不考虑管道通风散热和列车牵引等相关系统发热功率变化的情况下,管道温度变化主要由列车运行速度与阻塞比决定,在列车前进方向上管道温度升高,车尾方向管道温度降低;当真空度在0.01atm^0.10atm范围内变化时,列车表面最高温度变化较明显;当真空度为0.01atm时,在各个运行工况下列车表面温升均超过140 K。

In order to solve the thermal effect simulation issue of different maglev trains running in the low vacuum tubes,and better predict and prevent the thermal effect hazards caused by maglev trains running in tubes,taking maglev trains passing through the long and straight low vacuum tubes as an example,and without influencing the simulation results,the simplified physical model and numerical model were established based on the simulation software FLUENT to calculate the thermal effect of maglev trains in the low vacuum tubes,and research the effect of different running speeds of trains,the vacuum degree of tubes and the blockage ratio on thermal effect of maglev trains in the low vacuum tubes.The calculation results show that the temperature change of tubes mainly depends on the train running speed and the blockage ratio,without regard to the change in heating power of related systems such as tube ventilation and heat dissipation as well as train traction.The tube temperature increases in the train forward motion direction and decreases in the train rear direction;when the vacuum degree changes within 0.01atm^0.10atm,the maximum temperature on the train surface changes obviously;when the vacuum degree is 0.01atm,the temperature rise of the train surface exceeds 140 K under various working conditions.