Experimental and numerical exploration on the nonlinear dynamic behaviors of a novel bearing lubricated by low viscosity lubricant

The high temperature liquid Lead-Bismuth (PbBi) solution lubricated bearing is an essential supporting component of the two-circuit main loop system in the nuclear power station. Revised dynamic lubrication models with cavitation effects are developed. The influences of the clear-ances, rotating speeds, eccentricity ratios and annular guiding groove on the hydrodynamic characteristics are studied. The results reveal that the peak pressure ascends with the speeds and eccentricity ratios. The maximum/minimum pressure descends with the clearances. Theoretical analysis coincides with the experimental data. The rationality and correctness of the lubrication models have been verified. Research fruits provide a firm foundation for further research and engineering applications on such bearings.

Automated summary

The high temperature liquid Lead-Bismuth (PbBi) solution lubricated bearing plays a crucial role in the two-circuit main loop system of nuclear power stations. This study developed revised dynamic lubrication models considering cavitation effects and investigated the influences of clearances, rotating speeds, eccentricity ratios, and annular guiding grooves on the hydrodynamic characteristics. The results confirm the relationship between peak pressure, speeds, and eccentricity ratios, as well as the impact of clearances on maximum/minimum pressure. Theoretical analysis coincided with experimental data, verifying the rationality and correctness of the lubrication models.