多孔质气体静压轴承, 多孔质石墨, 静态性能, 渗透系数

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

porous aerostatic bearing, porous graphite, static performance, permeability