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Numerical study on the interaction between unsteady compression and unsteady expansion wave
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 Title & Authors
Numerical study on the interaction between unsteady compression and unsteady expansion wave
Kim, Hui-Dong; Setoguchi, Toshiaki;
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 Abstract
A new control method to alleviate the impulsive noise at the exit of high-speed railway tunnel was applied to the compression wave at the entrance of the tunnel. This method uses the interaction phenomenon of unsteady expansion wave and unsteady compression wave. Unsteady expansion wave was assumed to be made instantaneously by the simple theory of shock tube. Total Variation Diminishing method was employed to solve the axisymmetric unsteady compressible flow field with a specified compression wave. Numerical results show that the maximum pressure gradient of the propagating compression wave decreases with increase of the wave length of the unsteady expansion wave. It is found that the impulsive noise reduction can be obtained when the unsteady expansion wave with a large wave length is emitted just before the train enters the tunnel. The present results give the possibility to reduce the impulsive noise at the exit of tunnel.
 Keywords
Compressible Flow;Compression Wave;High-Speed Railway;Impulsive Noise;Shoci Tube;Unsteady Expansion Wave;Active Noise Control;
 Language
Korean
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