排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2018, Vol. 36 Issue (4): 300-306    DOI: 10.3969/j.issn.1674-8530.16.0178
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Influence of start-up acceleration on internal flow in impeller of nuclear reactor coolant pump
ZHONG Huazhou, ZHU Rongsheng, WANG Xiuli, ZHANG Benying, LU Yonggang
National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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Abstract 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.
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Articles by authors
ZHONG Hua-Zhou-*
ZHU Rong-Sheng
WANG Xiu-Li
ZHANG Ben-Ying
LU Yong-Gang
Key wordsnuclear reactor coolant pump   start-up transition process   start-up acceleration   stability   external characteristic test   simulation     
Received: 2016-08-05;
Cite this article:   
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.
 
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