In order to investigate the influence of different start-up accelerations on the internal flow of the nuclear reactor coolant pump during the start-up period, the experimental data of different transient acceleration external performances were regarded as the basis in this paper, wherein the variations of the flow rate and rotating speed with time were obtained. The obtained characteristic curves were used as boundary conditions into CFX for numerical simulation, besides, the pressure contour and the strea-mline gradient contour were analyzed during the start-up period. The results show that the start-up acceleration is directly related to the start-up time, but is independent of the time difference between the flow rate and the rotating speed reaching the steady value;the start-up acceleration has great influence on the flow stability and pressure amplitude of the impeller. In the start-up transition process, the bigger start-up acceleration corresponding to the inner flow of the impeller is very unstable, producing the vortex area with a certain intensity and area, and pressure fluctuation is large,while the smaller start-up acceleration corresponding to the internal flow of the impeller is stable, the pressure changes in uniform amplitude.The conclusion obtained in this paper is of great importance for the instability control of the nuclear reactor coolant pump in the start-up transition process.
ZHONG Hua-Zhou-*,ZHU Rong-Sheng,WANG Xiu-Li et al. Influence of start-up acceleration on internal flow in impeller of nuclear reactor coolant pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2018, 36(4): 300-306.
YANG Congxin,WANG Bin.3-D Numerical simulation on transient characteristics centrifugal pump during star-ting period [J].Journal of drainage and irrigation machinery engineering,2010,28(2):122-126.(in Chinese)
LI Wei, JI Leilei, SHI Weidong,et al.Starting characteristic of mixed-flow pump based on quasi-steady state assumption [J].Transactions of the CSAE,2016,32(7):86-92.(in Chinese)
ZHU Zuchao, GUO Xiaomei, CUI Baoling, et al. External characteristics and internal flow features of a centrifugal pump during rapid startup period [J]. Chinese journal of mechanical engineering, 2011, 24(5): 798-804.
LI Yibin,LI Rennian,WANG Xiuyong,et al.Numerical simulation of unstable characteristics in head curve of mixed-flow pump[J]. Journal of drainage and irrigation machinery engineering,2013,31(5):384-389.(in Chinese)
WANG Xiuli,YUAN Shouqi,ZHU Rongsheng,et al.Transient hydraulic characteristic study on nuclear reactor coolant pump during stopping period[J].Atomic energy science and technology,2013,47(3):364-370.(in Chinese)
WANG Xiuli,YUAN Shouqi,ZHU Rongsheng,et al.Transient hydraulic characteristic study on nuclear reactor coolant pump in variable flow transient process[J].Atomic energy science and technology,2013,47(7):1169-1174.(in Chinese)