Elucidation of flame propagation mechanism in dust explosion

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14379
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 25020:Safety engineering-related
• Research Institution: Hiroshima University
• Principal Investigator: Kim Wookyung 広島大学, 先進理工系科学研究科(工), 准教授 (40781852)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 粉塵爆発 / アルミニウム

Outline of Final Research Achievements

In this study, flame propagation mechanism of aluminum powder was experimentally investigated by simultaneously measuring the distance between particles and flame propagation behavior in a microgravity field. It was confirmed that flames propagated in microgravity even at concentrations below the minimum explosible concentration in normal gravity experiments. Furthermore, a tendency that the flame speed decreases with decreasing dust concentration was obtained, and the dependence of flame speed on the aluminum particle concentration in microgravity was clarified. The dependence of the minimum explosible concentration and minimum ignition energy of aluminum powder on particle size and oxygen concentration was also experimentally demonstrated.

Free Research Field

安全工学

Academic Significance and Societal Importance of the Research Achievements

この研究の成果は、粉塵爆発の火炎伝播メカニズムに関する理解を深め、防災対策や安全性確保に重要な知見を提供している。特に、微小重力場を用いた実験により、通常の重力下では得られない詳細なデータが得られ、火炎伝播や粒子挙動の特性が明らかになった。これにより、粉塵爆発事故の予防や対策のためのより効果的な手法の開発が可能となり、産業施設や宇宙空間での作業環境の安全性向上に貢献が期待できる。