Nonlinear transient analysis of rigid rotor mounted on externally pressurized double-layered porous gas journal bearings accounting velocity slip

Abstract

The present work aims at estimating the journal center trajectories of a rigid rotor mounted on a hybrid, finite gas lubricated journal bearings with double-layered porous bushing using nonlinear transient analysis. To consider velocity slip in the film at the interface between film and porous region, Reynolds equation is modified using the Beavers-Joseph boundary condition. The governing equations of flow at clearance, porous regions are discretized using finite volume method. The variable values at cell-face centers are obtained using interpolation scheme of third order. Those discretized equations coupled with equations of rigid rotor motion are solved by third-order total variation diminishing Runge-Kutta scheme. Influence of velocity slip and design parameters on critical mass parameter values were explored. The observations are presented in the form of graphs that serves as a reference during the design of such bearings.

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

“…Chen et al (2017) analyzed the effect of rarefaction on the stiffness of aerostatic thrust bearing. Mallisetty et al (2020) modified the Reynolds equation to analyze the influence of velocity slip on the journal bearing center trajectories by Beavers–Joseph boundary condition. Most of the above studies paid attention to the effect of boundary slip on the dynamic characteristics, whereas the influence of boundary slip on the thermal and static performance of thrust has rarely been mentioned.…”