CAJ | 학술논문

为分析评价压水堆核电厂稳压器波动管管型对热分层现象的影响，提出采用螺纹管来减弱热分层的措施。利用计算流体力学（CFD）分析方法，对升温、升压阶段波动管原型和改进模型的热分层现象进行数值模拟，得到两种模型不同波动流速下沿波动管轴线方向的截面最大温差分布以及流场分布。对比分析结果表明：波动管结构由光管改为螺纹管后流场紊动加强并出现涡流，冷热流体间的混合增强，与原型相比可使波动管的截面温差减小约1/3，从而有效地减弱热分层的影响。
위분석평개압수퇴핵전엄은압기파동관관형대열분층현상적영향，제출채용라문관래감약열분층적조시。이용계산류체역학（CFD）분석방법，대승온、승압계단파동관원형화개진모형적열분층현상진행수치모의，득도량충모형불동파동류속하연파동관축선방향적절면최대온차분포이급류장분포。대비분석결과표명：파동관결구유광관개위라문관후류장문동가강병출현와류，랭열류체간적혼합증강，여원형상비가사파동관적절면온차감소약1/3，종이유효지감약열분층적영향。
In order to analyze and evaluate the effect of pipe type on thermal stratifica-tion for PWR pressurizer surge line ,computational fluid dynamics (CFD) method was used for the current and improved screw surge line during heating up condition .The maximum temperature differences and velocity distribution along the surge line axis under different velocities were obtained .Comparative analysis indicates that replacing current smooth tube with screw pipe can enhance the turbulent flow and the mixing effects between the hot and cold fluids . The temperature differences in flow cross-sections along the screw surge line axis are reduced by about 1/3 compared with current smooth surge line ,yielding effectively mitigation to the influence of thermal stratifica-tion .