2022 Fiscal Year Final Research Report
Fire safety standard for polymeric materials in microgravity environments
| Project/Area Number |
19K04836
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 24010:Aerospace engineering-related
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| Research Institution | Gifu University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 燃え拡がり / 固体材料 / 複合材 / 可燃限界 / スケール解析 |
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| Outline of Final Research Achievements |
The evaluation of the flammability limit of plastics is one of the most important issues for manned space missions. We propose a simplified model for predicting flame spread behavior through scale analysis for homogeneous mono-material plastics and inhomogeneous plastics like carbon fiber reinforced plastics (CFRP). The heat conduction through gas-phase drives the flame spread over a thin homogeneous solid material. The developed model including the thickness effect well represented the flammability limits if the properties of the material are given properly. On the other hand, CFRP has large conductivity along the carbon fiber, which overwhelms the gas-phase heat conduction. Due to such characteristics, CFRP has the opposite blow-off sensitivity of conventional homogeneous plastics, that is, its limiting oxygen concentration decreases with the increase of opposed flow velocity.
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| Free Research Field |
燃焼工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では，民間企業の参入が著しい軌道上有人宇宙活動，また月面基地建設・火星有人探査などの国際宇宙開発プロジェクトなど有人宇宙環境における火災安全の確立を念頭に，微小重力および低重力環境における固体燃焼の特徴を明らかにする．この中で固体材料の形状（厚み）の影響を考慮したモデルの構築，また，単一素材の材料だけでなく，微量添加剤が含まれる固体材料，複合材のように異方性を持つ固体材料にも応用できる燃え拡がりモデルの構築を行う．この成果は，今後の有人宇宙活動における火災安全基準の策定につながるものである．
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