Study on Flowability of the Gap Oil Film of the Multi-oil Pad Hydrostatic Bearing with Variable Viscosity

Abstract

According to the large size multi-oil pad hydrostatic bearing, the mathematical model of three-dimensional flow of the gap oil film of the hydrostatic bearing is established in considering the influence of variable viscosity and centrifugal force condition. The finite element method and the finite volume method are used to simulate the flow field of the gap oil film of the large size hydrostatic bearing, and the flowing law of the gap oil film of the hydrostatic bearing is revealed. The results show that the interior of the gap oil exists turbulence when the inlet flowrate and the rotating velocity of the worktable are greater than a critical value. then The critical inlet flowrate and the worktable critical rotating velocity of the oil cavity from the laminar to the turbulence are found. The simulation matches well with the theoretical calculation value by comparative analysis of the simulation and the theoretical calculation value. That provides the theoretical basis for the characteristic research of the variable viscosity fluid and the theoretical calculation method for the large size hydrostatic bearing designing. method for the large size hydrostatic bearing designing.