爆発シミュレーションに特化した水素・空気系の総括反応モデルに関する理論的検討

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タイトル別名
  • Theoretical Analysis of Global Reaction Model of H<sub>2</sub>/air System Specialized for Explosion Simulation
  • バクハツ シミュレーション ニ トッカ シタ スイソ ・ クウキケイ ノ ソウカツ ハンノウ モデル ニ カンスル リロンテキ ケントウ

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説明

<p>Gas explosion is a high-speed flame propagation phenomenon. The apparent flame speed during an explosion accelerates because of flame instability. Since the damage caused by an accidental explosion is significantly influenced by the flame speed, one must accurately evaluate such flame acceleration when assessing the risk level of an explosion hazard. An important risk-assessment tool of an accidental explosion will be direct numerical simulation (DNS) using a global reaction model. Then, the global reaction model must correctly reproduce flame instability behaviors. This study focuses on the Markstein number of H2/air mixture, an important parameter that describes the instability strength, and theoretically investigates if a one-step global reaction model can reproduce the correct Markstein number that was computed by a detailedchemistry simulation. It is first found that transport properties that depend on equivalence ratio must be considered when evaluating the Markstein number of a H2/air mixture. It is also found that rate parameters (such as the global activation energy) that depend on equivalence ratio must be used to correctly reproduce the Markstein number using a global reaction model. It is recommended to determine the global activation energy by fitting the Markstein number of the global reaction model with that computed by a detailed-chemistry simulation.</p>

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  • 日本燃焼学会誌

    日本燃焼学会誌 56 (177), 251-257, 2014

    一般社団法人 日本燃焼学会

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