Abstract:The performance of aerostatic bearing with single and three air cavities was simulated based on Fluent software.A three-dimensional model of a aerostatic bearing was developed using the CATIA three-dimensional software.The finite volume method was used to solve the Reynolds equation of steady-state gas lubrication under isothermal conditions,and the effects of eccentricity,aspect ratio,film thickness,and spindle speed on bearing capacity and air flow of the bearings were analyzed.The results show that the bearing capacity of three-chamber air bearing is higher than that of single-chamber air bearing under the conditions of small eccentricity and low air supply pressure.With the increase of air supply pressure,the difference between the bearing capacity of the three-chamber structure and the single-chamber structure gradually increases,and the bearing capacity of the three-chamber structure is higher than that of the single-chamber structure.With the increase of the spindle speed,the gas film pressure distribution of the three-chamber structure is more 〖JP2〗uniform than that of the single-chamber structure,and the dynamic pressure effect is more obvious.The spindle with three-chamber structure has better stability and higher bearing capacity when running.