摘要
为了研究AP1000蒸汽发生器（SG）下封头对反应堆冷却剂泵（RCP）入口流场的影响,将SG下封头与RCP统一建模,采用CFD方法对其耦合模型进行全三维流场计算,分别研究了在稳态和瞬态情况下SG下封头对RCP入口流场的影响.稳态计算时,将均匀入流下缩尺泵的数值计算结果与试验结果进行对比,以验证数值计算方法的正确性;瞬态计算时,进行了时间步长无关性验证,以准确分析压力脉动特性.结果表明：在SG下封头的影响下,RCP入口处产生了周向不均匀的轴向速度并且形成了2个回转方向相反的旋涡;瞬态下,核主泵入口处形成了2个低压区,与均匀入流情况相比,监测点的压力系数标准差增幅达53%~90%;SG下封头使RCP入流产生预旋,且与叶轮形成较大的冲角,使得RCP扬程、效率分别下降了1.5%~7.7%,2.6%~4.1%.
To study the effect of AP1000 steam generator （SG） channel head on reactor coolant pump （RCP） inflow fieht, through modeling integrally the channel head of SG and RCP, the three-dimen- sional flow fiehl of the above coupling models were simulated by the CFD method and the influence of SG channel head on RCP inflow field was studied on steady and transient conditions. On the steady condition, the accuracy of the numerical model was verified through comparing numerical simulation results with experimental results of the scaled RCP under uniform inflow. On the transient condition, time step independence was verified to study accurately the pressure fluctuation characteristics. Results show that at RCP inlet, SG channel head causes non-uniform circumferential axial velocity and two w）r- rices which rotate in the opposite direction. On the transient condition, there are two-low pressure re- gions at RCP inlet and standard deviation of monitor points＇ pressure coefficient is increased by 53% - 90% , eompared with the condition of uniform inflow. Because of SG ehannel, RCP inflow generates prewhirl and approaches the impeller blades at a big incidence angle which reduce the head and efficiency by 1.5% -7.7% and 2.6% -4. 1% respectively.
出处
《排灌机械工程学报》
EI
CSCD
北大核心
2016年第4期277-282,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家973计划项目(2015CB057301)
中国博士后科学基金资助项目(2014M560483)
