School of Locomotive and Rolling Stock Engineering, Dalian Jiaotong University, Dalian 116028, China.
School of Electronic Information and Automation, Civil Aviation University of China, Tianjin 300300, China.
Sensors (Basel). 2023 Feb 23;23(5):2461. doi: 10.3390/s23052461.
Due to aerodynamic resistance, aerodynamic noise, and other problems, the further development of traditional high-speed electric multiple units (EMUs) on the open line has been seriously restricted, and the construction of a vacuum pipeline high-speed train system has become a new solution. In this paper, the Improved Detached Eddy Simulation (IDDES) is used to analyze the turbulent characteristics of the near wake region of EMU in vacuum pipes, so as to establish the important relationship between the turbulent boundary layer, wake, and aerodynamic drag energy consumption. The results show that there is a strong vortex in the wake near the tail, which is concentrated at the lower end of the nose near the ground and falls off from the tail. In the process of downstream propagation, it shows symmetrical distribution and develops laterally on both sides. The vortex structure far from the tail car is increasing gradually, but the strength of the vortex is decreasing gradually from the speed characterization. This study can provide guidance for the aerodynamic shape optimization design of the rear of the vacuum EMU train in the future and provide certain reference significance for improving the comfort of passengers and saving the energy consumption caused by the speed increase and length of the train.
由于空气动力学阻力、空气动力噪声等问题，传统高速动车组在开阔线路上的进一步发展受到严重限制，因此，建设真空管道高速列车系统成为新的解决方案。本文采用改进的分离涡模拟（IDDES）方法分析了真空管道中 EMU 近尾流区的湍流特性，从而建立了湍流边界层、尾流和空气动力阻力能量消耗之间的重要关系。结果表明，尾部附近的尾流中存在很强的涡旋，集中在靠近地面的车头下部，并从尾部脱落。在下游传播过程中，它呈现出对称分布，并在两侧横向发展。远离车尾的涡旋结构逐渐增加，但从速度特征来看，涡旋的强度逐渐减小。本研究可为未来真空动车组列车尾部的空气动力学外形优化设计提供指导，对提高旅客舒适度和节约因列车提速和长度增加而导致的能耗具有一定的参考意义。
