Analysis on the Static Performance of Porous Graphite Aerostatic Thrust Bearings

摘要

Numerical simulation was processed with FLUENT based on Finite Volume Method. Analysis and research was implemented on the relative factors,such as the supply gas pressure and the permeability of the porous graphite,which will affect the static performance of porous aerostatic thrust bearings,and thus the diagram of curves was produced accordingly. According to the experiments implemented on the self-manufactured rig,a series of experimental data was produced,revealing the static performance of load capacity and static stiffness. Good agreement has been achieved between the experimental results and the numerical simulation results,which has approved the feasibility of the numerical calculation. The results also indicate that when the gas film gap is distributed in the scope of 3 micro and 5 micro,the static stiffness value of the entire porous graphite aerostatic thrust bearing can be more than 70 N/μm if the porous graphite restrictor is one with the viscous permeability of 7.95×10-15 m2,with the thickness of 10 mm,and with the diameter of 45mm.