Numerical and experimental investigation on the performance of hybrid porous gas journal bearings

Abstract

As the progress of the high-speed performance requirement for porous gas journal bearings continuing, the aerodynamic effect, which plays a key role in the state of lubrication, causes the porous gas journal bearings being gradually to be used as hybrid bearings. This paper firstly presents a theoretical analysis on the lubrication mechanism of the hybrid bearings. The gas flow in the porous and clearance is modelled by using the mass continuity equation. Two

A novel transient computational fluid dynamics-fluid–structure interaction model for the pad adaptive motion and rotordynamic coefficients of hybrid porous tilting pad bearings

“…The comparison of the direct stiffness and direct damping for gas porous journal bearing between the present study and the reference data 13 : (a) the averaged direct stiffness false( K X X + K Y Y false) / 2 and (b) the averaged direct damping false( C X X + C Y Y false) / 2.…”

“…To assess the precision of the transient CFD-FSI model in predicting rotordynamic coefficients for gas porous bearings, a comparative analysis was performed between the present study and a prior study with the mass-conservation Reynold model. 13 The main bearing configurations and operating conditions are presented in Table 4. As depicted in Figure 5, the leakage flow rate of the steady CFD model had good agreement with the experiment results.…”

“…The comparison of the flow rate for gas porous journal bearing between the present study and the experiment data. 13 …”

“…For example, according to the lubrication model, 6 a significant discrepancy of the rotordyanmic coefficients was seen between the numerical analysis and the experimental data for the gas porous journal bearing. 13 Therefore, it was essential to develop a more precise flow model for both the porous restrictor and bearing clearance.…”