Development of a new shock wave attenuation method using solid-gas-liquid multiphase multi-layer media interaction with consideration of acoustic impedance

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K03849
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 19010:Fluid engineering-related
• Research Institution: Tohoku University
• Principal Investigator: Ohtani Kiyonobu 東北大学, 流体科学研究所, 特任准教授 (80536748)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 衝撃波圧力 / 衝撃波圧力低減 / 固気液混相多層媒体 / 音響インピーダンス / 光学可視化計測

Outline of Final Research Achievements

In this study, the shock wave pressure attenuation effect of various interaction media is investigated to establish a new method of shock wave pressure attenuation by interference with solid-gas-liquid multiphase media considering acoustic impedance. The shock wave interaction behavior with the interaction media was numerically simulated and compared with the experimental results. Experimental and numerical analyses indicated that the physical mechanism of the shock wave attenuation phenomenon due to the interaction was different for each interaction medium (water droplets, multilayer wire gauze, nonwoven fabric). Furthermore, the results showed that effective shock wave attenuation can be achieved by using a solid-gas-liquid multiphase multi-layer interference medium that is composed of a combination of the obtained knowledge and characteristics.

Free Research Field

流体工学、衝撃波工学

Academic Significance and Societal Importance of the Research Achievements

本研究課題の遂行によって、種々干渉媒体（水液滴群、多層網媒体、難燃性不織布）との干渉による衝撃波圧力低減現象の機序が解明された。この得られた知見を用いて考案した、音響インピーダンスを考慮した固気液混相多層媒体を用いる、新たな衝撃波圧力低減手法はほぼ確立に至ったと考える。この新手法を用いる実際に衝撃波圧力からの被害を低減させるための防御装置、防護具等の将来的な開発は、医療、土木・建築分野に関わる安全工学で大きな寄与が期待できると考える。