CAJ | 학술논문

基于相似原理建立了耦合四叶梅花形支撑板的蒸汽发生器“单元管”三维物理模型。采用考虑汽泡聚合与破碎效应的MUSIG (multiple-size-group)模型描述二次侧汽泡尺度分布和水力特性，热相变模型计算二次侧汽液两相沸腾相变过程，对大亚湾蒸汽发生器汽液两相流动与沸腾过程进行数值研究。模拟结果表明，支撑板位置处汽、液相流速均急剧升高，产生射流，在离开支撑板孔口时迅速形成回流。两相邻支撑板间出现明显的汽泡由小到大的周期性变化过程，冷、热端沿程汽泡最大直径缓慢减小。二次侧平均传热系数与 Rohsenow 经验关联式的计算结果吻合较好。
기우상사원리건립료우합사협매화형지탱판적증기발생기“단원관”삼유물리모형。채용고필기포취합여파쇄효응적MUSIG (multiple-size-group)모형묘술이차측기포척도분포화수력특성，열상변모형계산이차측기액량상비등상변과정，대대아만증기발생기기액량상류동여비등과정진행수치연구。모의결과표명，지탱판위치처기、액상류속균급극승고，산생사류，재리개지탱판공구시신속형성회류。량상린지탱판간출현명현적기포유소도대적주기성변화과정，랭、열단연정기포최대직경완만감소。이차측평균전열계수여 Rohsenow 경험관련식적계산결과문합교호。
Based on similarity principle, a three-dimensional“unit pipe”physical model is built for a steam generator coupled with quatrefoil tube support plates. A multiple size group model considering breakup and coalescence of bubbles is used to describe bubble size distribution and hydraulic characteristic in the secondary side. The process of local vapor-liquid two-phase boiling with phase change is calculated through a thermal phase change model. Numerical investigation is carried out on vapor-liquid two-phase flow and boiling of steam generator at Daya Bay Nuclear Power Plant. Simulation results show that vapor and liquid velocities rapidly increase in the support plate and jet flow appears, and when the flow leaves the support plate orifice, reflow forms rapidly. The periodic distribution from small to large bubble size occurs obviously within adjacent tube support plates and the maximum bubble diameter decreases slowly in the direction of hot and cold legs. In addition, the averaged heat transfer coefficient of secondary side agrees well with the results calculated using Rohsenow’s correlation.