Research on the disappearance phenomenon of forming shock wave in the non-linear propagation of compression wave in the long tube

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560199
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Kyushu University
• Principal Investigator: AOKI Toshiyuki 九州大学, 総合理工学研究科(研究院), 教授 (20150922)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 圧縮波 / 衝撃波 / 非線形現象 / 境界層 / 非定常流れ / 遷移現象

Outline of Final Research Achievements

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 the disappearance phenomenon of forming shock wave in the non-linear propagation of compression wave in the long tube. In this research, detailed measurement of the changes phenomenon of the forming shock wave and the unsteady boundary layer about wavefront modification of the pressure wave which propagates in very long tube was performed using the detailed experiment which used the laser differential interferometer, and useful data was obtained.

Free Research Field

圧縮性流体力学