Research on Lubrication of Journal Bearing Considering the Coupling Effect of Couple Stress and Turbulence
When dealing with the combined influence of the couple stress effect and the turbulent flow effect,the coupling effect between the two is not considered.To analyze the comprehensive influence of the couple stress effect and turbulence effect more accurately,the modified turbulence Reynolds equation considering the coupling effect between the two is derived from the momentum equation of lubricant flow.Compared with the existing uncoupled model equations,the modified turbulent Reynolds equation,the coupled model equation,has a smaller calculation value for the dimensionless maximum film pressure of the bearing under the same eccentricity ratio,couple stress parameters,and average Reynolds number.At the same time,the modified turbulent Reynolds equation was used to analyze the variation of bearing performance parameters with eccentricity ratio under different couple stress parameters and average Reynolds number.It was found that with the increase of eccentricity ratio,the larger the couple stress parameter or the average Reynolds number,the larger the dimensionless maximum film pressure and dimensionless load capacity of the bearing.At the same time,the change of the couple stress parameter does not affect the dimensionless side leakage of the bearing.In addition,the proposed modified turbulent Reynolds equation applies not only to journal bearings but also to high-speed hydrodynamic lubricated bearings such as thrust bearings and elliptical journal bearings.
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