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오픈 소스 OpenFOAM을 이용한 원자력 격납 건물용 피동형 촉매 재결합기 수치해석 모델 개발
김군홍(G.H. Kim),김상백(S.B. Kim),홍성완(S.W. Hong) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
In water-cooled nuclear power reactors, a large amount of hydrogen could be released following postulated severe accident leading to the melting of the core. In order to mitigate the risk of hydrogen combustion, nuclear reactor containments are equipped with passive autocatalytic recombiners(PAR), which preventively oxidize hydrogen for concentration lower than that of the flammability limit. This study is mainly motivated to develop reliable simulator to predict the main features of PAR in context of opensource ‘OpenFOAM’. Catalytic reaction of H<SUB>2</SUB>-Pt is utilized by a single step reaction rate expression based on experimental relation. In order to account for multi-component diffusion effects, Fickian model is employed for species transport equations. For the performance of PAR, the efficiency of H<SUB>2</SUB> conversion is crucially affected by catalytic surface temperature. The conjugate heat transfer between gas flow and catalytic plates is applied to improve the predictive capability of temperature. In present study, predicted mole fraction of H<SUB>2</SUB> and temperature have good agreements with experimental data of REKO-3 facility. The detailed discussions are made for the conversion characteristics of PAR, Numerical result indicates that the developed code has the capability to simulate the catalytic surface reaction of PAR.