Analysis of Lubrication Characteristics of Water Lubricated Bearings for Flexible Rotors
In order to investigate the influence of the rotor's flexural deformation on the water film characteristics of water-lubricated bearings,in this paper,a common water-lubricated bearing-flexure rotor system model is constructed which is applied to pumps and other fluid machinery,based on the theory of hydrodynamic lubrication.A combination of the finite-difference method and finite-element method is adopted to solve the distribution of the film thickness and pressure of the water-lubricated bearing-flexure rotor system under different parameters.The results of the study show that,increasing the radius gap will result in a more uniform distribution of film thickness.At the same time,it will cause the water film pressure to decay by 0.5 times the pressure difference,reduce the flexural deformation of the rotor,reduce the eccentricity of the rotor,and significantly improve the lubrication effect.Increasing the aspect ratio will make the water film thickness and the flexural deformation of the rotor more significant,and will also cause the water film pressure to increase at a constant rate.In this paper,for every 0.2 increase in the aspect ratio the peak,dimensionless water film pressure increases by 0.05,which further reduce the stability of the bearing rotor system.Under small load conditions,the film thickness distribution is gentle and symmetrical,the water film pressure is low and small fluctuations.Increasing the load will make the fluctuation of the water film thickness is more obvious,and the incremental value of the peak pressure is nearly 2 times the rate of increase,and the peak area will be moved to where the end of the load applied to.When the load is increased to a certain extent,it can make the water film pressure appears to increase abruptly.This study provides an important reference for the design and optimization of water-lubricated bearings,and a certain numerical analysis basis for the study of fluid dynamic pressure lubrication theory.
Water lubricated bearingFlexible rotorFinite element methodWater film properties
万方数据
维普
