Abstract
A compression wave is generated ahead of a high-speed train, while entering a tunnel. This compression wave propa- gates to the tunnel exit and spouts out as a micro pressure wave, causing an exploding sound. In order to estimate the magnitude correctly, the mechanism of the attenuation and distortion of a compression wave propagating along a tunnel must be understood and experimental information on these phenomena is required. An experimental and numerical in- vestigation is carried out to clarify the mechanism of the propagating compression wave in a tube. The final objective of our study is to understand the mechanism of the attenuation and distortion of propagating compression waves in a tun- nel. In the present paper, experimental investigations are carried out on the transition of the unsteady boundary layer induced by a propagating compression wave in a model tunnel by means of a developed laser differential interferometry technique.
Highlights
Many transfer phenomena of the wave motion of the compressive fluid in the pipe can be confirmed in the industry
Experimental investigations are carried out on the transition of the unsteady boundary layer induced by a propagating compression wave in a model tunnel by means of a developed laser differential interferometry technique
We focus on the compression wave as seen in many cases on the Industrial problem
Summary
Many transfer phenomena of the wave motion of the compressive fluid in the pipe can be confirmed in the industry. Operating the air brake equipment in the car, and opening rapidly the valve or rupturing the pipe in gas pipe line, it becomes unsteady flow with a compression wave and expansion wave in the pipe tube. In these days, it becomes the problem of a pressure wave propagating in the pipe. This compression wave propagates to the tunnel exit and spouts out as an impulsive wave, causing an exploding sound. It is the primary purpose to capture a flow induced behind compression wave and to consider the characteristics of unsteady boundary layer
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