Evaluation of Boundary Lubrication Status for Nuclear Coolant Pump Thrust Bearings

Ma Haoxiang; Wang Yan; Yang Jiangang; Cui Huaiming; Xu Renyi; Kuang Chengxiao

doi:10.13832/j.jnpe.2024.040020

Volume 46 Issue 3

Jun. 2025

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Ma Haoxiang, Wang Yan, Yang Jiangang, Cui Huaiming, Xu Renyi, Kuang Chengxiao. Evaluation of Boundary Lubrication Status for Nuclear Coolant Pump Thrust Bearings[J]. Nuclear Power Engineering, 2025, 46(3): 220-223. doi: 10.13832/j.jnpe.2024.040020

Citation:

Ma Haoxiang, Wang Yan, Yang Jiangang, Cui Huaiming, Xu Renyi, Kuang Chengxiao. Evaluation of Boundary Lubrication Status for Nuclear Coolant Pump Thrust Bearings[J]. Nuclear Power Engineering, 2025, 46(3): 220-223. doi: 10.13832/j.jnpe.2024.040020

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Evaluation of Boundary Lubrication Status for Nuclear Coolant Pump Thrust Bearings

doi: 10.13832/j.jnpe.2024.040020

1.
School of Energy and Environment, Southeast University, Nanjing, 211189, China
2.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2024-04-16
Rev Recd Date: 2024-05-23

Available Online: 2025-06-09

Publish Date: 2025-06-09

Abstract

Abstract

The state of lubrication significantly affects bearing wear. In this paper, a method for judging the boundary lubrication of thrust bearings of the nuclear power plant reactor coolant pump (nuclear coolant pump) based on the pressure-speed (P-ω) function curve is proposed. A thrust bearing test rig was set up, and the boundary lubrication speed under different temperatures and specific pressures was determined by monitoring torque changes, obtaining the P-ω function curve. After the specific pressure increases, the boundary lubrication speed rises. Above the curve is the fluid lubrication zone, and below is the boundary lubrication zone. A tiltable pad thrust bearing model was established based on the Reynolds equation, analyzing the relationship between speed and specific pressure under different oil inlet temperatures and film thicknesses. The study found that when the film thickness decreased to 2.5 μm, the calculated P-ω function curve was basically consistent with the experimental results. An increase in oil inlet temperature leads to a decrease in viscosity, and the boundary lubrication P-ω function curve shifts upward as a whole. This research can provide guidance for judging the lubrication state of nuclear coolant pump thrust bearings.
- Nuclear coolant pump,
- Thrust bearing,
- Boundary lubrication,
- Specific pressure-speed (P-ω) function curve

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References(14)

References

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