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MARS-KS를 이용한 수평형 응축열교환기의 저장탱크 내의 열유동 특성 예측
신병수(Byungsoo Shin),설광원(Kwang-won SEUL),도규식(Kyusik Do) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
For the performance of a horizontal condensation heat exchanger, the flow characteristics in the storage tank are important factors to determine the heat transfer rate outside the tubes. The objective of this work is to predict the heat transfer rate and flow characteristics outside the heat exchanger tubes using MARS-KS code. To eliminate the effect of condensation heat transfer inside the tubes, the experimental results on temperature profiles were applied to the inside wall of tubes as boundary conditions. In conclusion, the numerical results of MARS-KS had good predictions with experimental results on heat transfer coefficients.
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원자력발전소의 다중 구획에서 화재특성 예측을 위한 FDS 검증 (Part I: 과환기화재 조건)
문선여(Mun, Sun-Yeo),황철홍(Hwang, Cheol-Hong),박종석(Park, Jong Seok),도규식(Do, Kyusik) 한국화재소방학회 2013 한국화재소방학회논문지 Vol.27 No.2
원자력발전소의 강제 환기가 적용된 밀폐된 다중구획에서 실규모 pool 화재를 모사하기 위하여 FDS가 적용되었다. FDS의예측성능은 수치결과와 OECD/NEA 화재실증실험 국제공동연구 프로젝트(PRISME)를통해 얻어진 실험결과의비교를 통해 평가되었다. 단순한 연소모델의 적용으로 발생되는 FDS의 본질적인 한계를 제외하고 FDS 수행과정에서 발생된 사용자 의존성에 따른 FDS의 예측결과 차이를 명확히 확인하기 위하여, 과환기 화재조건이 본 연구에서 검토되었다. 특히 강제 환기시스템에서 정확한 경계조건의 중요성이 상세하게 논의되었다. 급기 및 배기를 위한 환기구의 경계조건은 구획 내부의 열 및 화학적특성에 큰 영향을 주고 있음을 FDS 결과를 통해 알 수 있었으며, 정확한 경계조건이 부여된 FDS는 원전 타입의 다중 구획 내부의 온도, 열유속 및 화학종 농도를 정량적으로 잘 예측하고 있음을 확인하였다. The Fire Dynamics Simulator (FDS) has been applied to simulate a full-scale pool fire in well-confined and mechanically ventilated multi-compartments representative of nuclear power plant. The predictive performance of FDS was evaluated through a comparison of the numerical data with experimental data obtained by the OECD/NEA PRISME project. To identify clearly the FDS results regarding to the user-dependence in the process of FDS implementation except for the intrinsic limitation of FDS such as simple combustion model, only the over-ventilated fire condition was chosen. In particular, the importance of accurate boundary conditions (B.C.) in mechanically ventilated system were discussed in details. It was known from FDS results that the B.C. on inlet and outlet vents did significantly affect the thermal and chemical characteristics inside the compartments. Finally, it was confirmed that the FDS imposed an accurate ventilation B.C. provided qualitatively good agreement with temperatures, heat fluxes and concentrations measured inside the nuclear-type multi-compartments.
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수평형 응축열교환기에서 이상유동양식에 대한 유량분배의 영향 평가
신병수(Byungsoo Shin),김남석(Namseok Kim),설광원(Kwang-won SEUL),도규식(Kyusik Do) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this study, it was performed to estimate effects of flow distributions on two-phase flow patterns in horizontal condensation heat exchanger. Detailed flow fields were calculated using commercial CFD code assuming working fluid as a single phase flow at simplified geometry. The results shows the differences of mass flow rate between heat exchanger tubes could be up to about 40% depending on averaged mass flow rate and features of geometry. At Tandon map which is one of well-known two-phase flow pattern map especially for horizontal condensation tubes, the differences could lead to the change of two-phase flow patterns. It means that performance of heat exchanger and criteria of water hammer also could be changed. Therefore, the effect of flow distribution was considered at design of horizontal condensation heat exchanger.
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