Numerical Simulation on Air Resistance of High-speed Train Passing through Tunnel

doi:10.3901/JME.2020.04.193

Abstract

Abstract: Using one-dimensional(1D) compressible unsteady non-homentropic flow model and the method of characteristics of generalized Riemann variables, air resistance of a CR400AF passing through a tunnel is studied. The relationship among air resistance, pressure changes and air velocity around the train, and the reflection and intersection of the compression wave and expansion wave is analyzed in detail. And the characteristics of air resistance is revealed. The effects of tunnel length, blockage ratio, train velocity and train length on air resistance of the train passing through a tunnel(especially long tunnel) were studied. Results show that only the reflection and intersection of the compression wave and expansion wave induced by the train entering or exiting the tunnel is needed in studying the pressure wave. However, the propagation directions of compression wave and expansion wave must be considered simultaneously when studying the air resistance and air velocity around the train. The air resistance increases with tunnel length, blockage ratio, train velocity and train length. According to the degree of influence on air resistance in long tunnel case, train velocity, train length, blocking ratio and tunnel length is for the descending order. The average air resistance is approximately proportional to 2 power of train velocity, 0.67-0.79 power of blocking ratio, and 0.02 power of tunnel length.

Key words: air resistance, high-speed train, railway tunnel, one-dimensional flow model, method of characteristics

CLC Number:

U451
V211

JIA Yongxing, JING Jing, MEI Yuangui. Numerical Simulation on Air Resistance of High-speed Train Passing through Tunnel[J]. Journal of Mechanical Engineering, 2020, 56(4): 193-200.

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