Research on the transition phenomena of the attenuation with distance on pressure wave propagating in the long tube

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A compression wave, a shock wave and an expansion wave are generally called a pressure wave. These waves induce rapid pressure fluctuation. In order to control the rapid pressure fluctuation at the time of these pressure waves propagating in a long tube(a pipeline and a tunnel), it is required to get to know correctly attenuation of the strength of the pressure wave and time modification of a wavefront in a propagation process, i. e., the nonlinear phenomenon of propagation and attenuation with distance. In this research, detailed measurement of the changes phenomenon of the unsteady boundary layer about wavefront modification of the pressure wave which propagates in a long tube/tunnel was performed using the detailed experiment which used the laser differential interferometer, and useful data was obtained.