Abstract
By integrating the average flow equation and Ng–Pan turbulence model using the boundary condition of mass conserving [Jakobsson-Floberg-Olsson (JFO)], a mixed lubrication model for misaligned bearing was established considering the effects of turbulence and cavitation. The numerical solution was obtained using a finite difference scheme. The results indicate that the frictional force and moment calculated using the JFO boundary condition are greater than those calculated using the Reynolds boundary condition under the constant external load. In high speed conditions, the turbulence begins to play a role, which makes the maximum oil film pressure and moment decrease and the minimum oil film thickness, cavitation zone, and friction coefficient increase. The boundary condition and turbulence have important effects on the equilibrium position of the axis. The misalignment leads to an obvious increase in the friction of the mixed lubrication area and a slight decrease in that of the hydrodynamic lubrication area.
Highlights
Journal bearings are widely used in a variety of rotating machineries, such as wind power, turbine, and ship stern shaft, and their tribological properties directly affect the safety and reliability of the rotor system
Sun and Gui1 studied the influence of shaft deformation on the full film lubrication performance of bearing and found that journal misalignment has important effects on the oil film pressure distribution, oil film thickness distribution, and moment
The above research did not consider the influence of misalignment on the lubrication performance of the bearing in the mixed lubrication (ML) state. de Kraker et al.6 established the mixed lubrication model of water-lubricated bearing through the average Reynolds equation7 and calculated the Stribeck curve of the bearing
Summary
Journal bearings are widely used in a variety of rotating machineries, such as wind power, turbine, and ship stern shaft, and their tribological properties directly affect the safety and reliability of the rotor system. Scitation.org/journal/adv of turbulence on the lubrication performance of misaligned bearing under the condition of constant load and found that turbulence reduces the maximum hydrodynamic pressure and increases the friction coefficient. Awasthi and Maan discussed the effect of turbulence on the performance of textured hydrodynamic lubricated bearing. Jang and Khonsari used the Elrod algorithm to study the tribological performance of misaligned bearing He et al. compared the friction coefficients under the two boundary conditions and found that the friction coefficient calculated using the JFO condition is greater than the result of the Reynolds condition. The research on the effects of turbulence and cavitation on the mixed lubrication performance of misaligned journal bearing is still lacking. The effects of turbulence, cavitation, and misalignment on the mixed lubrication performance of bearing are studied. The research results can provide reference for journal bearing design
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
