A new modified boundary slip model for thrust bearing performance under fluid-thermal-structure interaction regime

Purpose This study aims to investigate the thermohydrodynamic (THD) and thermoelastohydrodynamic (TEHD) performance of an air-lubricated thrust bearing under different slip conditions, especially the slip length effect. Design/methodology/approach In this study, a new modified boundary slip model was established to investigate thrust bearing performance. The THD and TEHD bearing characteristic distribution was analyzed with fluid-thermal-structure interaction approach. The effect of the slip length on the bearing performance was studied using various bearing structure parameters. Findings The increased slip length changed the classical feature distribution of the film pressure and temperature. The sacrifice of the bearing load capacity effectively compensated for the aerodynamic thermal effect and friction torque under the slip condition. The TEHD model has a lower film pressure and load capacity than the THD model. However, it also has lower film temperature, lower friction torque and smaller Knudsen number (Kn). Originality/value The bearing THD and TEHD performances of the modified boundary slip model were compared with those of a traditional no-slip bearing. The results help to guide the selection of the bearing surface materials and processing technology of rotor and foil, so as to fully control the degree of slip and make use of it.

Automated summary

This study investigates the thermohydrodynamic (THD) and thermoelastohydrodynamic (TEHD) performance of an air-lubricated thrust bearing under different slip conditions, particularly the effect of slip length. A modified boundary slip model is established to analyze bearing performance. The results show that increased slip length alters the distribution of film pressure and temperature. Sacrificing bearing load capacity compensates for the aerodynamic thermal effect and friction torque under slip conditions. The TEHD model exhibits lower film pressure and load capacity compared to the THD model, but also lower film temperature, friction torque, and Knudsen number (Kn).