CAJ | 학술논문

利用三维计算流体力学软件CFX 12.0对由7根带螺旋状定位绕丝的燃料棒组成的快堆燃料组件典型棒束通道内的流动和传热现象进行了数值模拟。模拟得到不同 Re下的压降系数曲线与 N u曲线，并将计算结果与经验公式的计算结果进行了比较，两者符合较好。研究了组件内3类典型子通道的横向流交混效应，分析了3类典型子通道的横向流分布特点，发现角子通道横向流交混强度沿轴向波动较大，而3类子通道的横向流交混强度均存在周期性。研究了中心燃料棒壁面上3个截面的局部换热效应，发现在燃料棒与绕丝接触处传热效果最差，在事故分析时应重点关注。
이용삼유계산류체역학연건CFX 12.0대유7근대라선상정위요사적연료봉조성적쾌퇴연료조건전형봉속통도내적류동화전열현상진행료수치모의。모의득도불동 Re하적압강계수곡선여 N u곡선，병장계산결과여경험공식적계산결과진행료비교，량자부합교호。연구료조건내3류전형자통도적횡향류교혼효응，분석료3류전형자통도적횡향류분포특점，발현각자통도횡향류교혼강도연축향파동교대，이3류자통도적횡향류교혼강도균존재주기성。연구료중심연료봉벽면상3개절면적국부환열효응，발현재연료봉여요사접촉처전열효과최차，재사고분석시응중점관주。
Commercial CFD code CFX 12.0 was used as an approach to investigate the flow and convective heat transfer phenomena of a typical 7-pin fuel bundle with wrapped-wire .The pressure drop coefficient and Nusselt number under different Re were obtained , and the simulation results are in good agreement with empirical correlations .The transverse flow effects in three kinds of typical subchannels were investigated ,and its features were analyzed .The results show that the corner channel’s transverse flow intensity varies heavily along the axial direction ,and the transverse flow intensities in three typical subchannels show periodic feature .The local Nusselt number distribution on three cross sections of the central rod surface was also analyzed .The results show that the minimum local Nusselt number occurs close to the contact location of wire and rod ,which means that the convective heat transfer condition is the worst in such area ,and the special attention in accident analysis is deserved .