2023 Fiscal Year Final Research Report
Development of Engineering Estimation Model on the Critical Condition for Ignition of Flowing Premixed Flammable Mixture by Heated Surface based on Academic Investigation
| Project/Area Number |
21H01576
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 25020:Safety engineering-related
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| Research Institution | Suwa University of Science |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
桑名 一徳 東京理科大学, 創域理工学研究科国際火災科学専攻, 教授 (30447429)
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| Project Period (FY) |
2021-04-01 – 2024-03-31
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| Keywords | 着火 / リスクアセスメント / 水素 / モデリング / 高温熱面 |
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| Outline of Final Research Achievements |
To contribute to risk assessment of next-generation fuels that contribute to carbon neutrality, we conducted a series of study aimed at developing a method for predicting the ignition of a flowing flammable premixture caused by a high-temperature hot surface. First, we performed an ignition experiment on a propane/air premixture to clarify the flow velocity dependence of the heat flux, which is the critical condition for ignition, and clarified by dimensional analysis that it is governed by the Peclet number. We extended this model to apply to hydrogen/air premixtures and confirmed good prediction results. Furthermore, we showed the possibility of detecting ignition as early as approximately 80 s by analyzing the autocorrelation coefficient of the gas phase temperature data around the hot surface over time.
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| Free Research Field |
火災安全工学，燃焼工学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では可燃性予混合気が高温熱面に衝突した場合に，着火に至る臨界条件を予測できる学術的モデルの構築に取り組んだ。着火に至る熱流束および着火温度を有次元の形で予測できるモデルを次元解析により構築し，これが燃料種によらず適用可能であることを示した。さらに，温度の自己相関係数の経時変化から着火を予測できる可能性を見出した。これらはこれまで明らかにされていなかった事項であり，学術的に大きな価値がある。これらの知見は今後の脱炭素エネルギーの社会実装に向けたリスク評価手法として幅広く応用可能である。この点に本研究の社会的意義があると確信する。
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