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분할 형태 혼합날개가 장착된 연료집합체 내부 난류유동 분포 수치해석
이공희(GongHee Lee),정애주(AeJu Cheong) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
In general, the turbulent flow inside PWR (Pressurized Water Reactor) fuel assembly depends on the mixing vane configuration and the pattern of the mixing vane arrangement on the strap of the spacer grid. In addition, this flow consists of the swirl flow in a subchannel and the cross flow between the rod gaps. The swirl flow improves the heat removal at the rod surface by mixing the hot water near the rod surface with the relatively cold water at the center of the subchannel, while the cross flow mitigates the peak temperature by exchanging the hot and cold water between subchannels. In this study, in order to examine the turbulent flow structure inside fuel assembly with the split-type mixing vanes, simulations were conducted with the commercial CFD software, ANSYS CFX R.14. The predicted results were compared with the measured data from the MATiS-H (Measurement and Analysis of Turbulent Mixing in Subchannels-Horizontal) test facility. Although there were locally differences between the prediction and the measurement, ANSYS CFX R.14 predicted the time averaged velocity field in the reliable level. The predicted horizontal and vertical velocity components were more in agreement with the measured data than the axial velocity component.
선회 형태 혼합날개가 장착된 연료집합체 내부유동 분포 수치해석
이공희(Gonghee Lee),신안동(Andong Shin),정애주(Aeju Cheong) 대한설비공학회 2016 설비공학 논문집 Vol.28 No.5
As a turbulence-enhancing device, a mixing vane installed at a spacer grid of the fuel assembly plays a role in improving the convective heat transfer by generating either swirl flow in the subchannels or cross flow between fuel rod gaps. Therefore, both configuration and arrangement pattern of a mixing vane are important factors that determine the performance of a mixing vane. In this study, in order to examine the flow distribution features inside 5×5 fuel assembly with swirl-type mixing vanes used in benchmark calculation of OECD/NEA, simulations were conducted with commercial CFD software ANSYS CFX R.14. Predicted results were compared to data measured from MATiS-H (Measurement and Analysis of Turbulent Mixing in Subchannels-Horizontal) test facility. In addition, the effect of swirl-type mixing vanes on flow pattern inside the fuel assembly was described.