【摘要】 为了改善某核电厂推力轴承表面由于空化导致的磨损现象，延长核主泵的使用寿命，考虑在核主泵中推力轴承润滑回路增设二级迷宫螺旋泵。通过加设增压装置，提高回路压力，减少空化现象。本文建立该核主泵一级迷宫螺旋泵等比例三维模型，利用FLUENT流体仿真软件开展数值计算，对流场的压力、速度及温度分布进行分析，将计算结果与某核电厂实际运行结果进行比较，验证建立模型和数值计算方法的准确性。设计二级迷宫螺旋泵并进行数值模拟，研究发现：增设二级迷宫螺旋泵后，润滑回路进出口压升为3.30×10~5 Pa，扬程提升33.67%，进出口截面温升为3 K。研究结果对迷宫螺旋泵在工程实际中的设计与使用具有一定的参考价值。更多还原

【Abstract】 In order to improve the wear phenomenon caused by cavitation on the surface of the thrust bearing in a certain nuclear power plant and extend the service life of reactor coolant pump, it is considered to add a second-stage labyrinth screw pump to the lubrication circuit of the thrust bearing in the reactor coolant pump. By installing a pressure boosting device, the circuit pressure is increased and cavitation is reduced. In this paper, the three-dimensional model of the first-stage labyrinth screw pump in the reactor coolant pump is established, and the numerical calculation is carried out by using FLUENT software to analyze the pressure, velocity and temperature distribution of the flow field. The calculation results are compared with the actual operation results of the nuclear power plant to verify the accuracy of the model and the numerical calculation method.A second-stage labyrinth screw pump is designed and numerically simulated. It is found that after adding the second-stage labyrinth screw pump, the pressure rise at the inlet and outlet of the lubrication circuit is 3.30×105 Pa, the head is increased by 33.67%, and the temperature rise at the inlet and outlet section is 3 K. The research results have a certain reference value for the design and application of labyrinth screw pump in engineering practice.更多还原