2022 Fiscal Year Final Research Report
Flame spread over composites consisting of materials with different thermal properties
Project/Area Number |
21K20389
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Research Category |
Grant-in-Aid for Research Activity Start-up
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Allocation Type | Multi-year Fund |
Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
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Research Institution | Hokkaido University |
Principal Investigator |
Yusuke Konno 北海道大学, 工学研究院, 助教 (10907728)
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Project Period (FY) |
2021-08-30 – 2023-03-31
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Keywords | 燃え拡がり / 消炎 / 熱損失 / 複合材料 / 火災安全 / 電気火災 / 燃焼 |
Outline of Final Research Achievements |
Downward flame spread tests were conducted using printed circuit boards and acrylic plates. The effects of sample width, sample thicknesses, and sample side conditions on the flame spread rate, flame shape, and limiting oxygen concentration were experimentally clarified. To obtain generalized test results, in which the effects of the sample holding method and sample shape are not apparent, a air gaps equivalent to the flame quenching distance was provided between the sample sides and the metal plate. As a result, it was clarified that the flame spreads uniformly along the sample and that a two-dimensional flame spread phenomenon could be confirmed. It was also experimentally clarified that the air gap size between the sample sides the metal plate for observing the two-dimensional flame spread phenomenon depends on the shape of the sample such as width and thickness.
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Free Research Field |
燃焼工学
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Academic Significance and Societal Importance of the Research Achievements |
電気火災に関与する可燃物の多くは良導体と絶縁体から構成される複合材であり,このような熱的性質が顕著に異なる材料から構成される電気部品等の燃焼機構は極めて複雑である.本研究では実験的検討を基礎に,複合材の難燃性を科学的に正確に評価可能な燃焼試験法を提案することを目標に,着火方法・試料保持方法・試料形状が試料の燃焼特性に及ぼす影響を体系的に調査した.本研究で得られた成果により,複合材特有の燃焼時の熱損失効果や試料の幾何形状効果が明らかになった.また,複合材において二次元的な燃え拡がりを実現する試験法を確立し,試料保持方法や試料形状に依存しない複合材の燃焼特性に関わるデータを得ることを可能にした.
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