Aerodynamic Simulation Analysis Of Evacuated Tube Maglev Trains

The forthcoming energy shortage and the need to travel fast present many difficulties in the21st century for traditional transportation, such as shipping, railway, waterway, and road transportation. Evacuated tube maglev train gets much concern because of its many advantages. Due to the designed speed of evacuated tube train is600～1000km/h in the future, though no mechanical friction for a high-speed train in a duct is concerned, the air resistance must be considered because of the pipe not being pumped into pure vacuum. However, research on the evacuated tube is relatively small. At the same time, life rescue must be considered for its high-speed train and vacuumed environments. We studied the relationships of the aerodynamic drag, shape of head and tail, blockage ratio of the train and different vacuum pressures, and further proposed a rescue plan of the maglev train to the braking failure in this paper.Chapter Ⅰ, we mainly introduces the main research contents and feasibility of the tube maglev system, expounded the significance of the research topic through introducing the background of evacuated tube, and cited three kinds of evacuated tube system at home and abroad.Chapter Ⅱ, we briefly introduces the train aerodynamics research methods, simulation software in this paper and the three major theoretical of computational fluid dynamics through describing the train flow field in its running process.Chapter Ⅲ, based on the Navier-Stokes (N-S) equations of incompressible viscous fluids and the standard k-ε turbulence model with assumptions of steady state and two dimensional conditions, a simulation of the aerodynamic drag on a maglev train in an evacuated tube was made with ANSYS/FLOTRAN software under different vacuum pressures, blockage ratios, and shapes of train head and tail.Chapter IV, compared with the curve of the simulation results, experimental datum for the relationship of the aerodynamic drag of maglev train under different vacuum, blocking ratio that gets from the evacuated tube maglev test platform (Key Laboratory of Magnetic Levitation Technologies and Maglev Trains, Superconductivity and New Energy R&D Center (SRDC), Southwest Jiaotong University) are discussed.Chapter V, based on Newton’s second law, we derived the relationship among the arresting displacement, arresting force and the beginning of the train speed according to carrier aircraft arresting deck-landing.Finally, article gets optimized security and relative economic parameters of the vacuum pipe. The results obtained may provide a helpful reference and guidance for future evacuated tube maglev train applications.