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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.
강경준(Kyung Jun Kang),김영인(Kim Young In),김긍구(Kim Keung Koo) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The SCS(Shutdown Cooling System) plays a role to cool down the reactor from the hot shutdown condition to the refueling temperature, and maintains the RCS(Reactor Coolant System) refueling condition. The SCS consists of two independent trains with a 100% capacity each, and each train is designed to be sufficient to remove the decay heat from reactor. This study is to evaluate capacity of the heat exchanger of shutdown cooling system.
이재선(Jae-Seon Lee),김종인(Jong-In Kim),김지호(Ji-Ho Kim),박홍윤(Hong-Yune Park),김긍구(Keung-Koo Kim) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.38 No.-
Water-lubrication ball bearings are. required to install in aqueous medium where water is used as coolant or working fluid. However water-lubricated frictional characteristics of stainless steel ball bearing is not well known compared to oil-lubricated frictional characteristics. Furthermore study on friction at high temperature is rare because bearing maintenance strategy for water-lubricated or chemicals-lubricated bearings of equipment is mostly based on change of failed bearings and parts. Ball bearings and ball screws are installed on the power transmission for a developing integral reactor and these are lubricated with high temperature and high pressure chemically-controlled water. Bearings and power transmitting mechanical elements for an atomic reactor needs high reliability and high performance during estimated lifetime, and their performance should be verified. In this paper, experimental research results of frictional characteristics of water-lubricated ball bearing are reported.
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.