| Evacuated Tube Transportation (ETT) will be the next traffic-transportation model. ETT has some advantages that it is imposable for today's traffic-transportation model to have. Supported by National Science Foundation of China (No. 50678152), and based on Navier-Stokes equation and k-εdouble-equation turbulent model of 2D, viscous, stable and incompressible fluid, the aerodynamic drag of high-speed train and the fluid around the vehicle in evacuated tube are simulated by using the finite volume numerical simulation software FLUENT, and the simulation results are analyzed in this paper.The aerodynamic drag of high-speed train in evacuated tube is studied in three aspects. First, pressure in evacuated tube is considered as one of the important factors which influent train's drag. The aerodynamic drag of high-speed vehicle in tube with 5 different pressures is simulated. Second, blockage ratio is another influence factor. In this paper, 6 different blockage ratios are given to calculate the drag. By analyzing the simulation results of situation one and two, and comparing them with the drag of train which runs on the ground and under the normal pressure, ETT's advantages, such as fast, efficiency, etc, are demonstrated. Third, train's head shape is also the influence factor. Streamlined and protruding head can efficiently decrease the aerodynamic drag of high-speed vehicle in evacuated tube according to the simulation and analyses of the drag of train with 5 types of head shape.
|
PDF Full Text Request