低真空管道列车表面压力变化规律研究

既有高速铁路进一步提速受限,构建低真空管道运行超高速列车的发展趋势日益明显.运用滑移网格技术,建立动车组列车和低真空管道的三维耦合模型,考虑管道气体的瞬态压缩效应,分析低真空管道横截面积、动车组列车运行速度、管道环境温度和环境压力对车体表面压力的影响.研究表明,低真空管道横截面积、动车组列车运行速度、管道环境温度和环境...

Research on Surface Pressure Variation of Train in Low Vacuum Tube

The speed increase of existing high-speed railway is limited,and the development trend of constructing low vacuum pipeline to run ultra-high-speed train is increasingly apparent.Using a three-dimensional,unsteady,compressible turbulence algorithm and slip grid technology,a coupling model of low vacuum pipeline and ultra-high-speed train is established to analyze the impact of train speed,vacuum pipeline vacuum,blockage ratio,and ambient temperature on the body surface pressure.Studies show that the measuring point pressure is basically unchanged along the length of the vehicle body,and is also basically unchanged at the same cross-section with the same train speed,the same low vacuum pipeline vacuum,cross-sectional area and temperature.The surface pressure amplitude of the head car,middle car and tail car is proportional to the 2.2 power of train speed,has a linear increasing relationship with blockage ratio,and has a linear increasing relationship with the environmental pressure of tube,which is basically not affected by temperature;The higher train speed,the higher the blockage ratio,and the higher environmental pressure of tube,the greater the amplitude of the pressure fluctuations on the surface of the car body when the train is running.