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| Aerostatic bearing with porous restrictor: state-of-the-art and future perspectives |
| GU Yandong1,2,3, BÖHLE Martin3, SCHIMPF Artur3, YUAN Shouqi1* |
| 1. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 3. Chair for Fluid Mechanics and Fluid Machinery, Technical University Kaiserslautern, Kaiserslautern 67663, Germany |
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Abstract Aerostatic bearings with porous restrictor work with externally pressurized gas, forming a gas film, achieving support and positioning. The reviewing contents are as follows. Explain the support principle of porous bearings and introduce the pressure distribution characteristics of gas film. Summarize the applications of porous materials in bearings and find that carbon graphite porous materials have relative advantages. Review the research status on the flow models, the solution methods and the expe-riments and find that Reynolds lubrication equation and Darcy equation are the main method to establish the flow models of porous bearings. Summarize the bearing optimization methods and find that intelligent optimization methods have been implemented. The future perspectives are as follows. Considering the inertial effect, establish a three-dimensional compressible flow model of porous bearings based on the Reynolds lubrication equation and the Darcy-Forchheimer equation, as well as a numerical method. Considering the inertial action of the rotor on the gas film, use CFD dynamic mesh technique for the prediction of the dynamic characteristics of porous bearings. Investigate the influence of tempe-rature, material deformation, etc. on the static and dynamic characteristics of porous bearings. Design an alignment system and adopt a high-frequency laser displacement sensor, measure the static and dynamic characteristics of porous bearings. Establish a multi-parameter and multi-objective optimization platform of porous bearings, specifically optimize the load capacity, the gas feeding power, etc.
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Received: 15 October 2019
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