Abstract:For the study on hump phenomenon of an reactor coolant pump, three-dimensional modeling for the pump internal flow was done by Pro/E, and based on the Reynolds-averaged Navier-Stokes equations with the RNG k-ε turbulence model and SIMPLEC algorithm, the flow was calculated using the computational fluid dynamics software CFX. The results show that: the numerical simulation me-thod used is feasible to explain unsteady hump phenomenon of reactor coolant pump under small flow rate conditions. Pump outlet is located in the center of the pump shell, making the mainstream along the direction of rotation friction crashing with the liquid at the outlet, resulting in energy loss and lea-ding to the uneven distribution of the flow field. The symmetric structure of reactor coolant pumps, the complex vortex near inlet and outlet of impeller blades, secondary flow in guide vanes region and rotating stall are closely related to the formation of the hump. The reactor coolant pump running under small flow conditions will cause unstable flow, which can result in severe vibration.
龙云, 朱荣生, 付强, 袁寿其, 习毅. 核主泵小流量工况下不稳定流动数值模拟[J]. 排灌机械工程学报, 2014, 32(4): 290-295.
Long Yun, Zhu Rongsheng, Fu Qiang, Yuan Shouqi, Xi Yi. Numerical analysis on unstable flow of reactor coolant pump under small flow rate condition. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(4): 290-295.
[1]蔡龙, 张丽平. 浅谈压水堆核电站主泵[J]. 水泵技术, 2007(4): 1-9. Cai Long, Zhang Liping. Discussion of PWR main pump[J]. Pump Technology, 2007(4): 1-9.(in Chinese)[2]牟介刚,张生昌,郑水华,等. 离心泵性能曲线产生驼峰的机理及消除措施[J]. 农业机械学报, 2006,37(4):56-59. Mu Jiegang, Zhang Shengchang, Zheng Shuihua, et al.Reason for centrifugal pump performance curve hump and the elimination method[J]. Transactions of the Chinese Society for Agricultural Machinery, 2006, 37(4): 56-59.(in Chinese)[3]牟介刚,王乐勤. 离心泵性能曲线驼峰判据的探讨[J]. 农业机械学报,2004,35(4):74-76. Mu Jiegang, Wang Leqin. Approach to the criterion of hump on centrifugal pump performance curve[J]. Transactions of the Chinese Society for Agricultural Machinery, 2004, 35(4): 74-76.(in Chinese)[4]Sano T, Nakamura Y, Yoshida Y, et al. Alternate blade stall and rotating stall in a vaned diffuser [J]. JSME International Journal, Series B: Fluids and Thermal Engineering, 2002,45(4): 810-819.[5]Masahiro M, Hideaki M, Isamu U, et al. Unstable head-flow characteristic generation mechanism of a low specific speed mixed flow pump [J]. Journal of Thermal Science, 2006, 1(2):115-120.[6]Kaupert Kevin A, Staubli T. The unsteady pressure field in a high specific speed centrifugal pump impeller—Part I: Influence of the volute [J]. Journal of Fluids Engineering, 1999,121(9):621-626.[7]Liu Jintao, Liu Shuhong, Wu Yulin, et al. Numerical investigation of the hump characteristic of a pump-turbine based on an improved cavitation model[J]. Computers & Fluids, 2012,68:105-111.[8]刘竹青,肖若富,吕腾飞,等. 弯掠叶片对轴流泵驼峰及空化性能的影响[J]. 排灌机械工程学报, 2012, 30(3): 270-273. Liu Zhuqing, Xiao Ruofu, Lü Tengfei, et al. Effect of swept blade on hump and cavitation characteristics of axial flow pump [J]. Journal of Drainage and Irrigation Machinery Engineering, 2012, 30(3): 270-273.(in Chinese)[9]冉红娟,张瑶, 罗先武,等. 可逆式水轮机泵工况下驼峰现象的数值模拟[J]. 水力发电学报, 2011,30(3):195-199. Ran Hongjuan, Zhang Yao, Luo Xianwu, et al. Nume-rical simulation of the positive-slope performance curve of a reversible hydro-turbine in pumping mode [J]. Journal of Hydroelectric Engineering, 2011, 30(3):195-199.(in Chinese)[10]王春林, 彭娜, 康灿, 等. 模型泵内部流场的数值模拟[J]. 核动力工程, 2009, 30(4): 81-85. Wang Chunlin, Peng Na, Kang Can, et al. Numerical simulation of interior flow field of nuclear model pump[J]. Nuclear Power Engineering, 2009, 30(4): 81-85.(in Chinese)[11]张野, 王晓放, 介红恩. 压水堆冷却剂中硼酸浓度对核主泵性能影响研究[J]. 核动力工程, 2011, 32(4):95-98. Zhang Ye, Wang Xiaofang, Jie Hongen. Effect of boric acid concentration on reactor coolant pump performance in PWRs [J]. Nuclear Power Engineering, 2011, 32(4):95-98.(in Chinese)[12]Sinha M, Pinarbasi A, Katz J. The flow structure during onset and developed states of rotating stall within a vaned diffuser of a centrifugal pump [J]. Journal of Fluids Engineering,2001, 123(3):490-499.[13]Wang H, Tsukamoto H. Experimental and numerical study of unsteady flow in a diffuser pump at off-design conditions[J]. Journal of Fluids Engineering, 2003,125(5): 767-778.[14]潘中永,李俊杰,李红,等. 叶片泵旋转失速的研究进展[J]. 流体机械, 2011, 39(2):35-39. Pan Zhongyong, Li Junjie, Li Hong, et al. Overview for research on rotating stall of pump [J]. Fluid Machinery, 2011, 39(2):35-39.(in Chinese)