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論文

Computational fluid dynamics analysis for hydrogen deflagration tests at ENACCEF2 facility

Trianti, N.; 佐藤 允俊*; 杉山 智之; 丸山 結

Proceedings of 11th Korea-Japan Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-11) (Internet), 7 Pages, 2018/11

Simulation techniques have been developed to analyze the deflagration behavior of hydrogen generated during a hypothetical severe accident in nuclear power plants. The CFD analysis was carried out on the hydrogen deflagration experiment performed at the ENACCEF2 facility composed mainly of a vertical cylindrical tube filled with hydrogen-air mixture and nine annular obstacles were placed in the lower part of the tube. The simulation was carried out by the reactingFoam solver of OpenFOAM 3.0, an open source software for the CFD analysis. The RNG (Renormalization group) k-$$varepsilon$$ model was applied for turbulent flow. The interaction of the chemical reaction with the turbulent flow was considered using PaSR (Partial Stirred Reactor) model with 19 elementary reactions for the hydrogen combustion. The analysis result showed the characteristic of flame acceleration by the obstacle region was qualitatively reproduced even though has discrepancy with the experiment.

論文

ETSON-MITHYGENE benchmark on simulations of upward flame propagation experiment in the ENACCEF2 experimental facility

Bentaib, A.*; Chaumeix, N.*; Grosseuvres, R.*; Bleyer, A.*; Gastaldo, L.*; Maas, L.*; Jallais, S.*; Vyazmina, E.*; Kudriakov, S.*; Studer, E.*; et al.

Proceedings of 12th International Topical Meeting on Nuclear Reactor Thermal-Hydraulics, Operation and Safety (NUTHOS-12) (USB Flash Drive), 11 Pages, 2018/10

In the framework of the French MITHYGENE project, the new highly instrumented ENACCEF2 facility was built at the Institut de Combustion Aerothermique Reactivite et Environnement (ICARE) of the Centre National de la Recherche Scientifique (CNRS) in Orleans (France) to address the flame propagation in hydrogen combustion during a severe accident. The ENACCEF2 facility is a vertical tube of 7.65 m height and 0.23 m inner diameter. In the lower part of the tube, annular obstacles are installed to promote turbulent flame propagation. At the initiative of the MITHYGENE project consortium and the European Technical Safety Organisation Network (ETSON), a benchmark on hydrogen combustion was organised with the goal to identify the current level of the computational tools in the area of hydrogen combustion simulation under conditions typical for safety considerations for NPP. In the proposed paper, the simulation results obtained by participating organizations, using both Computational Fluid Dynamics (CFD) and lumped-parameter computer codes, are compared to experimental results and analysed.

口頭

燃焼速度モデルを用いた水素火炎伝播のCFD解析

茂木 孝介; Trianti, N.; 松本 俊慶; 杉山 智之; 丸山 結

no journal, , 

原子炉シビアアクシデント時には、高温になったジルコニウムと水蒸気の化学反応により、大量の水素が発生する。事故時の水素安全対策の向上は重要な課題であり、福島第一原子力発電所事故における水素爆発の発生以降、さらなる関心を集めている。数値流体力学による水素燃焼解析は事故シナリオ予測, 現象解明, 評価モデル構築を詳細に行うツールとして期待されているが、信頼性のある定量予測は現時点でも困難な課題である。本研究ではMITHYGENEプロジェクトで実施されたENACCEF2実験を対象とし、燃焼速度モデルの比較検討を試みた。燃焼の初期段階は基準状態における層流燃焼速度に大きく影響を受ける。一方で燃焼の後半は圧力依存性の重要度が増す。実験を再現するためには、層流燃焼速度に圧力依存性を適切に取り込む必要があることが分かった。計算した火炎伝播は、実験結果を定性的に良く再現した。

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