工况参数对核主泵水润滑推力轴承润滑性能和热弹变形的影响

Influence of Working Conditions on Lubrication Performance and Thermal and Elastic Deformation of Water-Lubricated Thrust Bearing for Nuclear Main Pump

针对第三代核电主泵水润滑轴承的工作特点,建立考虑热弹变形的推力轴承润滑性能的计算模型,研究推力轴承流、固、热耦合作用下的热弹流润滑特性,分析转速、载荷和瓦块弹性模量变化对水润滑推力轴承润滑性能和热弹变形的影响,计算的性能参数包括最小膜厚、最高温度、最大热变形和最大弹性变形。研究结果表明:最大热变形对转速和载荷的变化较为敏感,最大热变形随转速和载荷的增加而增大;最大弹性变形对载荷和弹性模量的变化较为敏感,最大弹性变形随载荷的增加而呈正比增大,最大弹性变形随弹性模量的增加减小的幅度较大。

A calculation model for the lubrication performance of thrust bearings considering thermal elastic deformation was established based on the working characteristics of water lubricated bearings in the third generation nuclear power main pump.The thermal elastohydrodynamic lubrication characteristics of thrust bearings under the coupling of fluid,solid,and heat were studied.The effects of rotational speed,load,and elastic modulus of the pad on the lubrication performance and thermal elastic deformation of water lubricated thrust bearings are analyzed.The performance parameters calculated include the minimum film thickness,the highest temperature,and the maximum thermal deformation and maximum elastic deformation.The results indicate that the maximum thermal deformation is more sensitive to changes in rotational speed and load,the maximum thermal deformation increases with the increase of rotational speed and load.The maximum elastic deformation is more sensitive to changes in load and elastic modulus,the maximum elastic deformation increases proportionally with the increase of load.The decrease in maximum elastic deformation is significant with the increase of elastic modulus.