Influence of steam generator channel head on reactor coolant pump inflow field
HOU Xiangtao1, WANG Pengfei1, XU Zhongbin1, RUAN Xiaodong2
1.Institute of Process Equipment, Zhejiang University, Hangzhou, Zhejiang 310027, China; 2.State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou, Zhejiang 310027, China
Abstract:To study the effect of AP1000 steam generator(SG)channel head on reactor coolant pump(RCP)inflow field, through modeling integrally the channel head of SG and RCP, the three-dimensional flow field of the above coupling models was 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 vortices which rotate in the opposite direction. On the transient condition, there are two-low pressure regions at RCP inlet and standard deviation of monitor points′ pressure coefficient is increased by 53%-90%, compared with the condition of uniform inflow. Because of SG channel, 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.
[1]张明乾,刘昱,李承亮.浅谈压水堆核电站AP1000屏蔽式电动主泵[J].水泵技术,2008(4):1-5. ZHANG Mingqian,LIU Yu,LI Chengliang.Introduction of AP1000 canned reactor coolant pump of pressurized water nuclear power plant[J].Pump technology,2008(4):1-5.(in Chinese)[2]李良.AP1000核反应堆用冷却剂泵水力模型的设计与研究[D].大连:大连理工大学,2010.[3]单玉姣.基于CFD的1 000 MW级核主泵水力模型模化计算方法研究[D].大连:大连理工大学,2010.[4]王福军,张玲,黎耀军,等.轴流式水泵非定常湍流数值模拟的若干关键问题[J].机械工程学报,2008,44(8):73-77. WANG Fujun,ZHANG Ling,LI Yaojun,et al.Some key issues of unsteady turbulent numerical simulation in axial-flow pump[J].Chinese journal of mechanical engineering,2008,44(8):73-77.(in Chinese).[5]施卫东,张光建,张德胜,等.入口非均匀流对轴流泵性能和压力脉动的影响[J].排灌机械工程学报,2014,32(4):277-282. SHI Weidong,ZHANG Guangjian,ZHANG Desheng,et al.Effects of non-uniform suction flow on performance and pressure fluctuation in axial-flow pumps[J].Journal of drainage and irrigation machinery engineering,2014,32(4):277-282.(in Chinese)[6]ESCH B P M V.Performance and radial loading of a mixed-flow pump under non-uniform suction flow[J].Journal of fluids engineering,2009,131(5):1-7.[7]夏栓,冯斌,张海军.AP1000核岛主泵流场数值模拟[J].核技术,2013,36(4):1-7. XIA Shuan,FENG Bin,ZHANG Haijun. Simulation of AP1000 reactor coolant pump flow field CFD[J].Nuc-lear techniques,2013,36(4):1-7.(in Chinese)[8]林诚格.非能动安全先进核电厂AP1000[M].北京:原子能出版社,2008.[9]丁斐.基于CFD的核电蒸汽发生器热工水力特性数值模拟研究[D].广州:华南理工大学,2013.[10]郭素娜, 孙立军, 方艳,等. 导流件和叶轮强作用涡轮流量计的CFD仿真方法[J]. 化工自动化及仪表, 2014, 40(10):1276-1280. GUO Suna,SUN Lijun,FANG Yan, et al. CFD simulation method for turbine flowmeter with strong action from guide vane and impellor[J]. Control and instruments in chemical industry, 2014, 40(10):1276-1280.(in Chinese)[11]BAKKER A, LAROCHE R D, WANG M H, et al. Sliding mesh simulation of laminar flow in stirred reactors[J].Chemical engineering research & design, 1997,75(1):42-44.[12]SPALART P R,ALLMARAS S R.A one-equation turbulence model for aerodynamic flows[J].La recherche aerospatiale,1992,439(1):5-21.[13]JONES W P,LAUNDER B E.The prediction of laminarization with a two-equation model of turbulence[J].International journal of heat & mass transfer,1972,15(2):301-314.[14]WILCOX D C.Turbulence model for CFD[M].California:DCW Industries Inc.,1993.[15]MENTER F R.Two-equation eddy-viscosity turbulence models for engineering applications[J].AIAA journal,1994,32(8):1598-1605.[16]YAKHOT V,ORSZAG S A. Renormalization-group analysis of turbulence[J].Physical review letters,1986, 57(14):1722-1724.[17]陈庆光,徐忠,张永建.RNG k-ε模式在工程湍流数值计算中的应用[J].力学季刊,2003,24(1):88-95. CHEN Qingguang,XU Zhong,ZHANG Yongjian.Application of RNG k-ε models in numerical simulations of engineering turbulent flows[J].Chinese quarterly of mechanics,2003,24(1):88-95.(in Chinese)[18]关醒凡.现代泵技术手册[M].北京:宇航出版社, 1995.[19]MAHAFFEY R M,VUUREN S J V.Review of pump suction reducer selection:eccentric or concentric reducers[J].Journal of the South African Institution of civil engineering,2014,56(3):65-76.[20]刘春宝,马文星,朱喜林.液力变矩器三维瞬态流场计算[J].机械工程学报,2010,46(14):161-166. LIU Chunbao,MA Wenxing, ZHU Xilin. 3D transient calculation of internal flow field for hydrodynamic torque converter[J]. Journal of mechanical engineering,2010,46(14):161-166.(in Chinese)[21]SHI F,TSUKAMOTO H.Numerical study of pressure fluctuations caused by impeller-diffuser interaction in a diffuser pump stage[J].Journal of fluids engineering, 2001,123(3):466-474.