Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
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-
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.
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.
松本 俊慶; 佐藤 允俊; 杉山 智之; 丸山 結
Proceedings of 25th International Conference on Nuclear Engineering (ICONE-25) (CD-ROM), 6 Pages, 2017/07
Hydrogen combustion including deflagration and detonation could become a significant threat to the integrity of containment vessel or reactor building in a severe accident of nuclear power stations. In the present study, numerical analyses were carried out for the ENACCEF No.153 test to develop computational techniques to evaluate the flame acceleration phenomenon during the hydrogen deflagration. This experiment investigated flame propagation in the hydrogen-air premixed gas in a vertical channel with flow obstacles. The reactingFoam solver of the open source CFD code, OpenFOAM, was used for the present analysis. Nineteen elementary chemical reactions were considered for the overall process of the hydrogen combustion. For a turbulent flow, renormalization group (RNG) k-e two-equation model was used in combination with wall functions. Three manners of nodalization were applied and its influences on the flame propagation acceleration were discussed.
佐藤 允俊; 松本 俊慶; 杉山 智之; 丸山 結
Proceedings of 8th European Review Meeting on Severe Accident Research (ERMSAR 2017) (Internet), 12 Pages, 2017/05
In this study, thermofluid dynamic analyses were carried out for 3 tests, HR3, HR5 and HR12 in the OECD/NEA THAI project, with the Passive autocatalytic recombiner (PAR) manufactured by AREVA. The major parameters in these 3 tests were the initial pressure and steam concentration in the test vessel. The analyses were performed with an open source computational fluid dynamics code, OpenFOAM. The solver was modified by embedding the correlation equations of hydrogen recombination rate for the PAR. The results from the present analyses indicated that the modified solver well reproduced the measured characteristics for PAR behaviour such as hydrogen recombination rate, flow velocity and temperature distribution, hydrogen and oxygen concentration, and so on.
佐藤 允俊; 松本 俊慶; 杉山 智之; 丸山 結
Proceedings of 10th Japan-Korea Symposium on Nuclear Thermal Hydraulics and Safety (NTHAS-10) (USB Flash Drive), 10 Pages, 2016/11
A numerical analysis was carried out on the thermal-hydraulic behavior during the operation of the PAR for the HR-5 test conducted in the OECD/NEA THAI project. In the HR-5 test, measurements were performed in the test vessel on the volume fractions of oxygen and hydrogen, gas temperature, pressure, flow velocity at the PAR inlet and so on. The open source code OpenFOAM was used for the present study with the reactingFoam solver which is appropriate to treat thermal-hydraulic phenomena including chemical reactions. The code was implemented with the correlation equations for the PAR used in the HR-5 and was modified to be capable of calculating the gas composition change during the recombination of hydrogen and oxygen. Comparison was made between the analysis and experimental results in the gas volume fraction and so on. It was shown that the analyses well reproduced the recombination behavior at the PAR and influences of the recombination heat on the thermal-hydraulic behavior.