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| Influence of optimization of impeller partial geometric parameters on coast- down performance of nuclear reactor coolant pump and its optimization |
| QIU Weifeng*, ZHU Rongsheng, WANG Xiuli, ZHONG WeiYuan, CAI Zheng |
| National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to investigate the influence of impeller import edge position, number of impeller blades and impeller wrap angle on coast-down performance of the nuclear reactor coolant pump, the dynamic simulation model of the the pump cost-down process of the nuclear reactor coolant pump model through the modeling method was established based on the characteristics of the pump. After the test was verified, the correct simulation program was finally established. Then by defining the head and torque curve simulation under different geometric parameters, the idle performance curve of the core pump was obtained under different conditions, and the better design situation was obtained.The results show that the effect of coast-down performance is mainly reflected in the nonlinear idle transition of the coast-down transition process. The larger the wrap angle, the better the coast-down performance of the pump, The smaller the number of impeller blades in a certain range, the better the coast-down perfor-mance. As the inlet side of the impeller extends forward, the corresponding pump has better coast-down performance: the 120° wrap angle and the inlet side position are selected as the b plan, and the number of impeller blades is 5. The optimized nuclear reactor coolant pump idle flow curve reaches the half flow time 0.07T or 0.91 s later than the corresponding curve before optimization. When the pump keeps other design parameters unchanged, but only geometric parameter is changed to optimize the coast-down performance, the lower the power curve corresponding to it, the better its coast-down performance.
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Received: 24 April 2018
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