Characteristics of Unsteady Boundary Layer Induced by the Compression Wave Propagating in a Tunnel

• 作者: Toshiyuki Aoki Toshiyuki Tanaka
• 来源期刊: 流体动力学(英文)
• 学科: 医学
• 关键词: Transition UNSTEADY BOUNDARY Layer Compression Wave Laser Differential INTERFEROMETRY
• 年，卷（期）: 2012,（4）
• 页码范围: 257-263
• 页数: 7页
• 分类号: R73

摘要

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.