Aerodynamic Characteristics and Change Rules ofVehicle Piston Wind in Evacuated Tube

YANG Yi, QIANG Guanglin, PENG Xu

Abstract

Piston wind is the main aerodynamic characteristics of the flow field in the evacuated tube,and thus grasping the basic characteristics and variation rules of the piston wind is the basis of a reasonable and effective control of the flow field of the tube. In this paper, the influences of piston air generation mechanism,aerodynamic characteristics and degrees of vacuum,blockage ratios, driving speeds and other conditions on the piston wind were analyzed and discussed by using the methods of computational fluid dynamics and dynamic meshing. This study finds that air in the pipeline is compressed and inflated during the running of the vehicle, producing compression and expansion waves and affecting the vehicle's driving resistance;Through a comprehensive analysis on a series of combined calculations for different degrees of vacuum,blockage ratios and driving speeds,it is found that the vehicle's driving resistance increases with the growth of the blocking ratio,pressure, and speed. Further,when the speed increases to a threshold, the increase of the vehicle’s driving resistance begins to slow down.

 

Keywords: evacuated tube transportation,  piston wind,  computational fluid dynamics, mechanism



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MI B G, ZHAN H, ZHU J. Simulation of aerodynamic drag of high-speed train in evacuated tube transportation [J]. Chinese Journal of Vacuum Science and Technology, 2013, 33(9):877—881. (In Chinese)

DONG T T. Study on aerodynamic performance of high-speed trains in the tunnel [D]. Chengdu:School of Mechanical Engineering, Southwest Jiaotong University, 2013:1—5. (In Chinese)

JING M J, HUANG L. Development status and trends of super high speed vacuum pipeline traffic technology [J]. Science and Technology in China,2017(11):1—3. (In Chinese)

JIA W G, DONG C G, ZHOU Y. Study on thermal-pressure coupling effect in the evacuated tube transportation system on blocking ratio [J]. Journal of Engineering Thermophysics, 2013, 34(9):1745— 1748. (In Chinese)

LI Y, ZHOU M D,SUN S X, et al. Model test study on piston wind of tunnels [J]. Journal of Railway Science and Engineering,2015,12 (1):145—149.(In Chinese)

CHEN X Y. Aerodynamic simulation analysis of evacuated tube maglev trains [D]. Chengdu:School of Mechanical Engineering, Southwest Jiaotong University,2013:13—17.(In Chinese)

LIU Y S. Numerical simulation on the aerodynamic drag and research rescue system of maglev train of evacuated tube transportation system [D]. Chengdu:School of Mechanical Engineering,Southwest Jiaotong University,2013:22—26. (In Chinese)

JIA W G. The characteristic investigation of evacuated tube transport system on thermodynamics [D]. Qingdao:College of Electromechanical Engineering,Qingdao University of Science and Technology,2013:26—33. (In Chinese)

DUAN R X. Research on thermal -pressure coupling effect aerodynamic characteristic in the evacuated tube transport system [D]. Qingdao:College of Electromechanical Engineering,Qingdao University of Science and Technology,2014:25—34.(In Chinese)

KIM T K, KIM K H, KWON H B. Aerodynamic characteristics of a tube train [J]. Journal of Wind Engineering & Industrial Aerodynamics,2011,99(12):1187—1196.

TANG Z P, YANG J G, WU S Q. Parametric conceptual design of evacuated tube transportation [J]. Manufacturing Automation, 2013,35(7):118—121. (In Chinese)


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