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핵연료집합체에서의 대형이차와류 혼합날개의 난류생성 특성에 관한 연구
안정수(J. S. An),최영돈(Y. D. Choi) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The common method to improve heat transfer in Nuclear fuel rod bundle is install a mixing vane in space grid. The previous split mixing vane is guides cooling water to swirl flow in sub-channel of fuel assembly. But, this swirl flow decade rapidly after mixing vane and the effect of enhancing the heat transfer vanish behind this short region. The large scale secondary vortex flow was generated by rearranging the inclined angle direction of mixing vanes to the coordinated directions. This LSVF mixing vanes generate the most strong secondary flow vortices which maintain about 35 D<SUB>H</SUB> after the spacer grid and the streamwise vorticity in subchannel with LSVF mixing vane sustain two times more than that in subchannel with split mixing vane. The turbulent kinetic energy and the Reynolds stresses generated by the mixing vanes have nearly same scales but maintain twice more than previous type.
김원갑,안정수,최영돈,Kim, W.K.,An, J.S.,Choi, Y.D. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.2
This study is focused on the development and selection of optimal cool tube system to maximize its thermal performance. Cool tube is devised to reduce the heating and cooling load of building by preheating or refreshing of intake air. Finite volume method was adopted to solve the conduction problem between the cool tube and earth. We examine the cool tube system for two operating periods, a short term(12 hours) and a long term(3 months). The results of short term operations reveal that condensation significantly influences and raises the exit air temperature. For long term operations, optimum conditions of cool tube system are obtained with variations of flow-rate, depth, length and diameter of cool tube.
김원갑,안정수,최영돈,Kim, W.K.,An, J.S.,Choi, Y.D. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.4
This study is focused on the development and selection of the optimal cool tube system to maximize its thermal performance. Cool tube is devised to reduce the heating and cooling load of building by preheating or refreshing of intake air with buried pipes. Finite volume method is adopted to solve the conduction problem between the cool tube and earth. We examine the cool tube system for two operating periods, a short term(12 hours) and a long term(3 months). The results of short term operations reveal that condensation significantly influences and raises the exit air temperature. For long term operations, optimum conditions of cool tube system are obtained with variations of flow-rate, depth, length and diameter of cool tube.
LSVF 혼합날개를 장착한 17 ×17 봉다발의 열유동 해석
이철민(C. M. Lee),안정수(J. S. An),최영돈(Y. D. Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Cross-flow of the sub-channel of nuclear reactor makes high thermal energy transfer from rod bundle to the flow and prohibits hot spot production which can induces thermal crack of rod bundle. To produce more cross-flow, various types of mixing vane were investigated. In this study, LSVF mixing vane in 17×17 rod bundle is simulated. RSM(Reynolds Stress Model) solver in FLUENT code is used. Mixing vanes decrease maximum temperature in rod and increase cross-sectional turbulence intensity. Comparison of LSVF mixing vanes with Split mixing vanes shows each characteristics.