Effect of thrust pad geometric parameters on characteristics of thrust bearing oil system for nuclear coolant pump
TANG Qianhao1, LAI Xide1*, CHEN Xiaoming1, LI Ping1, DU Jiang2, CHENG Hai2
1. School of Energy and Power Engineering, Xihua University, Chengdu, Sichuan 610039, China; 2. Framatome Dongfang Reactor Coolant Pump Co. Ltd., Deyang, Sichuan 618000, China
Abstract：To solve the problem that the temperature of the upper thrust pad is too high in the test process of the bidirectional thrust bearing of a nuclear coolant pump, without changing the structure size of the oil system and the thrust bearing, and the number of thrust pad, design grooves with diffe-rent sizes were designed on the side of the thrust pads to control the flow. An improved thrust pad was designed through multi-scheme optimization in order to solve the problem of high temperature of the upper thrust pad by optimizing the geometric parameters of the thrust pad. Based on the numerical simulation method, the flow field of the oil system was deeply analyzed. By comparing the flow field of two kinds of thrust pads, the influence of geometric parameters of the thrust pad on the flow and cooling performance of the bidirectional thrust bearing oil system was analyzed qualitatively, the influence of dynamic and cooling performance shows that under the same operation conditions the optimized thrust pad greatly reduces the oil flow hedging and blockage, eliminates the unreasonable backflow, and increases the cold oil flow into the channel. Thus the cooling effect of the oil system is improved, and the temperature of the upper thrust pad is obviously reduced, which meets the design requirements. And it is proved that the geometric parameters of thrust pad are the important factors affecting the characteristics of thrust bearing oil system. The results can provide a reference for exploring the influence of thrust pad geometry parameters on oil system characteristics and optimization of thrust pad geometry parameters similar to bearing system.
唐乾皓,赖喜德*,陈小明,李萍,杜江,程海. 推力瓦几何参数对核主泵推力轴承油系统特性的影响[J]. 排灌机械工程学报, 2020, 38(6): 560-565.
TANG Qianhao,LAI Xide*,CHEN Xiaoming,LI Ping,DU Jiang,CHENG Hai. Effect of thrust pad geometric parameters on characteristics of thrust bearing oil system for nuclear coolant pump. Journal of Drainage and Irrigation Machinery Engin, 2020, 38(6): 560-565.
