Abstract
Impulse waves are micro-pressure waves, which always occur at the tunnel exit when a high-speed train is moving inside a train tunnel. The air around the train nose is compressed and compression waves are induced. The impulse wave is discharged at the exit of a train tunnel when a compression wave propagates outside of the tunnel exit. Impulse waves are weak-strength pressure waves, which lead to noise and other environmental problems. In order to efficiently control the impulse wave at the exit of a train tunnel, numerical studies on investigating the generation and propagation of the impulse wave were carried out. A 2-D axisymmetric model tunnel was simulated at different operating conditions. Different Mach numbers of compression waves were varied to induce different magnitudes of impulse waves at the tunnel exit. In addition, compression waves with different pressure gradients were assumed at the tunnel entry to check their effects on the generation of impulse waves. In order to observe impulse waves at far field, five monitor points were installed behind the tunnel exit to record pressure histories as impulse waves moved through these locations. The detailed magnitudes and characteristics of impulse waves were obtained in the present studies.
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Recommended by Associate Editor Jungil Lee
Heuy Dong Kim received his B.S. and M.S. degrees in Mechanical Engineering from Kyungpook National University, Korea, in 1986 and 1988, respectively. He then received his Ph.D. from Kyushu University, Japan, 1991. Currently, Dr. Kim is a Professor in Andong National University, Korea. His research interests include High-Speed Trains, Ramjet and Scramjet, Shock Tube and Technology, Shock Wave Dynamics, Explosions and Blast Waves, Flow Measurement, Aerodynamic Noises, and Supersonic Wind Tunnels.
Guang Zhang received his B.S. degree in Mechanical Engineering from Three Gorges University, China, in 2012. He obtained his M.S. degree from both Zhejiang Sci-Tech University and Andong National University in 2015. Currently, he is pursuing his doctoral courses in Andong National University. His research interests include Micro Shock Tube, Schlieren Visualiztion, PIV Measurement and High-Speed Trains.
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Zhang, G., Kim, D.H. & Kim, H.D. Numerical analysis of impulse waves discharged at the exit of a model tunnel. J Mech Sci Technol 32, 2099–2109 (2018). https://doi.org/10.1007/s12206-018-0419-y
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DOI: https://doi.org/10.1007/s12206-018-0419-y