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RISS 인기검색어
- 검색키워드
- 저자 : 김긍구(K. K. Kim) (검색결과 3 건)
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김민환(M. H. Kim),이재선(J. S. Lee),박진석(J. S. Park),김종인(J. I. Kim),김긍구(K. K. Kim) 한국전산유체공학회 2003 한국전산유체공학회지 Vol.8 No.3
CFD analyses of the three-dimensional turbulent flow in the impeller and diffuser of an axial flow pump including suction and discharge parts are presented and compared with experimental data. The purpose of the current study is to validate the CFD method for the performance analysis of the main coolant pump for SMART and to investigate the effect of suction and discharge shapes on the pump performance. To generate a performance curve, not only the design point but also the off-design points were computed. The results were compared with available experimental data in terms of head generated. At the design point, the analysis accurately predicts the experimental head value. In the range of the higher flow rates, the results are also in very good agreement with the experimental data, in magnitude but also in terms of slope of variation. For lower flow rates, the results shows that the analysis considering the suction and discharge well describe the typical S-shape performance curve of the axial pump.
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김영인(Y.I. Kim),배영민(Y.M. Bae),정영종(Y.J. Chung),김긍구(K.K. Kim) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.1
SMART adopts, very unique facility, an FMHA to enhance the thermal and flow mixing capability in abnormal conditions of some steam generators or reactor coolant pumps. The FMHA is important for enhancing thermal mixing of the core inlet flow during a transient and even during accidents, and thus it is essential that the thermal mixing characteristics of flow of the FMHA be understood. Investigations for the mixing characteristics of the FMHA had been performed by using experimental and CFD methods in KAERI. In this study, the temperature distribution at the core inlet region is investigated for several abnormal conditions of steam generators using the commercial code, FLUENT 12. Simulations are carried out with two kinds of FMHA shapes, different mesh resolutions, turbulence models, and steam generator conditions. The CFD results show that the temperature deviation at the core inlet reduces greatly for all turbulence models and steam generator conditions tested here, and the effect of mesh refinement on the temperature distribution at the core inlet is negligible. Even though the uniformity of FMHA outlet hole flow increases the thermal mixing, the temperature deviation at the core inlet is within an acceptable range. We numerically confirmed that the FMHA applied in SMART has an excellent mixing capability and all simulation cases tested here satisfies the design requirement for FMHA thermal mixing capability.
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이준(J. Lee),강한옥(H. O. Kang),서재광(J. K. Seo),유승엽(S. Y. Ryu),윤주현(J. Yoon),김긍구(K. K. KIM) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this paper, the thermal hydraulic design characteristics of the power conversion system for SMART 330 MWt plant which the once-through helically-coiled steam generators have been installed was analyzed. The feedwater temp., total feedwater flow rate, steam pressure, total steam flow rate and steam temp. was analyzed vs. steam generator power on conditions of a constant feedwater temp. and steam pressure, and was compared with the commercial nuclear power plants. After the present analysis, it was evaluated that at the range of low power(about below 20%) the steam temp. is nearly same as the core outlet temp., and at the range of meddle power(about between 20 ~ 80%) it show gradually a upward trend, and at the range of high power(about between 80 ~ 100%) it show gradually a downward trend. These phenomena result from the once-through steam generator's model which consists of the 3 different type of regions, i.e., subcooled, boiling, and superheated region.
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