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Numerical analysis of impulse waves discharged at the exit of a model tunnel
- Source :
- Journal of Mechanical Science and Technology. 32:2099-2109
- Publication Year :
- 2018
- Publisher :
- Springer Science and Business Media LLC, 2018.
-
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.
- Subjects :
- Impulse wave
Mechanical Engineering
Acoustics
Numerical analysis
Rotational symmetry
Near and far field
Impulse (physics)
01 natural sciences
010305 fluids & plasmas
symbols.namesake
Mach number
Mechanics of Materials
0103 physical sciences
symbols
010301 acoustics
Pressure gradient
Geology
Longitudinal wave
Subjects
Details
- ISSN :
- 19763824 and 1738494X
- Volume :
- 32
- Database :
- OpenAIRE
- Journal :
- Journal of Mechanical Science and Technology
- Accession number :
- edsair.doi...........03a9aaf1875ecd4e35f3c1677f51e03b