Affiliation:
1. Department of Mechanical Engineering, Tokyo University of Science, 1-3 Kagurazaka Shinjuku-ku, Tokyo 162-8601, Japan
2. Department of Disaster System Science, Chiba Institute of Science, 3 Shiomi-cho Choshi-city, Chiba 288-0025, Japan
Abstract
This paper describes the pressure distribution in the bearing clearance of circular aerostatic thrust bearings with a single air supply inlet. For high air supply pressure, large bearing clearance, and a relatively small bearing outer radius, it was believed that shock waves are caused and that a complex fluid flow structure is formed in the bearing clearance. Accordingly, analytical models based on the occurrence of shock wave in the bearing clearance have been proposed. Recently, very small aerostatic bearings have been used in various machine devices where the pressure distribution near the air inlets has a large influence on the bearing characteristics due to a short distance between air inlets and the bearing edge. In order to predict various bearing characteristics accurately for these kinds of bearings, a proper analytical model has to be established. However, it is very difficult to obtain the detailed information about the flow structure from flow visualization because of a very thin bearing clearance. Therefore, we calculated the flow field using computational fluid dynamics, which can solve the Navier-Stokes equations directly. It was found that the airflow just after entering the bearing clearance becomes turbulent in a region where relatively rapid pressure recovery occurs and that no shock wave is generated at the boundary between subsonic and supersonic flow. In addition, the numerical results presented show good agreement with experimental data.
Subject
Surfaces, Coatings and Films,Surfaces and Interfaces,Mechanical Engineering,Mechanics of Materials
Reference11 articles.
1. Hydroinertia Gas Bearings for Micro Spinners;Hikichi;J. Micromech. Microeng.
2. Millimeter-scale, MEMS Gas Turbine Engine;Epstein
3. A Self-Acting Gas Thrust Bearing for High-Speed Micromotors;Wong;J. Microelectromech. Syst.
4. Theory on the Pressure Depression in Externally Pressurized Thrust Gas Bearing With Consideration of the Growth of Boundary Layers;Mori;J. JSLE
5. A Pseudo Shock Theory of Pressure Depression in Externally Pressurized Circular Thrust Gas Bearings;Mori
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