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Study on the one-dimensional governing equations of aerostatic circular thrust bearing with a single air supply inlet

Shang-Han Gao (School of Mechanical and Transportation Engineering, Guangxi University of Science and Technology, Liuzhou, China)
Sheng-Long Nong (Department of Mechanical Engineering, Liuzhou Institute of Technology, Liuzhou, China)

Industrial Lubrication and Tribology

ISSN: 0036-8792

Article publication date: 20 December 2022

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Abstract

Purpose

The purpose of this paper is to derive the one-dimensional governing equations to describe the pressure distribution, load capacity and stiffness of aerostatic circular thrust bearing with a single air supply inlet.

Design/methodology/approach

The film flow field is divided into four regions: supply pressure region, pressure dropping region, pressure rising region and laminar flow region. The influences of bearing clearance and supply pressure on the pressure distribution, load capacity and stiffness of the bearing are presented.

Findings

With the large film clearance and large supply pressure, the oblique shock wave occurs near the entrance of gas film, which greatly increases the pressure drop region. Hence, it is not appropriate to consider the oblique shock as a normal shock.

Originality/value

This paper introduces the invariants at the entrance of gas film, employs the functional relationships between density and pressure, and provides the empirical formulas for the pressure dropping and rising regions. The pressure distribution curves are therefore illustrated through a considerably simplified computational process.

Keywords

Acknowledgements

The authors gratefully acknowledge the support received through NSFC (Nos. 12062003), and the Guangxi Natural Science Foundation (No. 2021JJA160278).

Citation

Gao, S.-H. and Nong, S.-L. (2022), "Study on the one-dimensional governing equations of aerostatic circular thrust bearing with a single air supply inlet", Industrial Lubrication and Tribology, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/ILT-06-2022-0193

Publisher

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Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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