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IRWST 환형관 실험장치 내의 수소화염 가속현상에 대한 CFD 해석 연구
강형석(H.S. Kang),하광순(K.S. Ha),김상백(S.B. Kim),홍성완(S.W. Hong) 한국전산유체공학회 2012 한국전산유체공학회지 Vol.17 No.3
We developed a preliminary CFD analysis methodology to predict a pressure build up due to hydrogen flame acceleration in the APR1400 IRWST on the basis of CFD analysis results for test data of hydrogen flame acceleration in a scaled-down test facility performed by Korea Atomic Energy Research Institute. We found out that ANSYS CFX-13 with a combustion model of the so-called turbulent flame closure and a model constant of A = 5.0, a grid model with a hexahedral cell length of 5.0 mm, and a time step size of 1.0 × 10<SUP>-5</SUP> s can be a useful tool to predict the pressure build up due to the hydrogen flame acceleration in the test results. Through the comparison of the simulated results with the test results, we found out that the proposed CFD analysis methodology enables us to predict the peak pressure within an error range of about ±29% for the hydrogen concentration of 19.5%. However, the error ranges of the peak pressure for the hydrogen concentration of 15.4% and 18.6% were about 66% and 51%, respectively. To reduce the error ranges in case of the hydrogen concentration of 15.4% and 18.6%, some uncertainties of the test conditions should be clarified. In addition, an investigation for a possibility of flame extinction in the test results should be performed.
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.