管道断面外形对亚音速真空管道磁浮系统气动特性的影响

亚音速真空管道磁浮系统内部流场复杂,研究管道断面外形对气动效应的影响至关重要.基于计算流体力学,考虑流体粘性与列车悬浮间隙建立了三维亚音速真空管道列车空气动力学模型,数值模拟并对比分析了四种不同断面外形管道内的气动力、流场和气动热效应.4种典型的管道外形为圆形、马蹄形、矩形和拱形.研究结果表明:当阻塞比一定时,列车在拱...

Effect of Tube Cross-Section Shape on Aerodynamic Characteristics of Subsonic Evacuated Tube Maglev System

The internal flow field of a subsonic evacuated tube train is complex,and it is important to study the effect of the tube cross-section shape on the aerodynamic properties.Based on computational fluid dynamics(CFD),considering the fluid viscosity and train suspension gap,a three-dimensional aerodynamic model of subsonic evacuated tube train is established.The aerodynamic drag,flow field characteristics and aerodynamic heating effect in 4 different cross-sectional tube are numerical simulated and compared.The results show that when the blockage ratio is constant,the aerodynamic drag of the train in an arched tube is the smallest,and then the circular tube,the largest in the rectangular tube.The pressure gradient in the vertical direction of the circular tube is the smallest,and the pressure on the upper surface of the tube is also the smallest.In the subsonic evacuated tube maglev system,the maximum temperature is shown on both sides of the train bump,and the minimum temperature is on the tube surface.Tube cross-section shape has few effects on the temperature distribution.When the area of the tube cross-section is chosen,the arched tube is prior recommended,and next choice is the circular tube.