Transactions of Nanjing University of Aeronautics & Astronautics
Rotational Flow in a Narrow Annular Gap Based on Lattice Boltzmann Method
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Abstract:
For comprehensive characteristics of flow in a gas bearing， lattice Boltzmann method （LBM） is applied for study of the two-dimensional flow between two eccentric cylinders with the inner one rotating at a high speed. The flow pattern and circumferential pressure distribution are discussed based on critical issues such as eccentricity ranging from 0.2 to 0.9， clearance ratio varying from 0.005 to 0.01 and rotating speed in the range of 3×104—1.8×105 r/min. The analysis and discussion on the circumferential pressure distribution affirmed the quasilinear relation between the extremum pressure and rotating speed. Furthermore， a high eccentricity and small clearance ratio contributes most to the fluctuation of the circumferential pressure distribution. The flow pattern inside the channel exhibits separation vortex under a large eccentricity. The conclusions drawn in this work give rise to prediction of the flow pattern in the gas bearing which is beneficial for evaluating the performance of as well as instructing the design and development.
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TK05
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