Coupling Characteristics of Liquid-solid Two-phase Flow Field Structure and Particle Motion Behavior at Restricted Lubrication Interface

doi:10.3901/JME.2024.20.351

Abstract

Abstract: The lubricant was easily mixed with a variety of fine solid particles because of the complex working environment of the rotating system, which reduced the accuracy and stability of the equipment and caused wear and tear, noise, vibration, and damage to important system and supporting structure components. The inter-phase coupling effect between particles and fluid is taken into consideration for fluid dynamic pressure bearings in order to investigate the kinematic behavior of solid particles in the restricted lubrication interface and its feedback influence on the lubrication flow field structure. The coupling numerical model of discrete-phase solid particles and carrier-phase dynamic pressure fluid in the dynamic pressure lubrication process is established to analyze the interaction effects. The findings demonstrated that the fluid produced a secondary flow phenomenon at the inlet under the influence of the centrifugal force field and fluid shear stress gradient. As a result, only about 29.97% of the total number of particles entered the wedge gap and stayed in the convergence zone or flowed out of the flow field from the end drain. Very few particles(about 0.38%) flowed into the gap divergence zone, and their trajectories had a feather-like shape. Its velocity shows an overall decreasing trend in the convergence zone. The dissertation provides a reference for the lubrication characteristics of the restricted lubrication interface and the optimum design of the structure by elucidating the motion characteristics of the oil particle motion and their impact on the dynamic pressure performance of the oil film.

Key words: fluid dynamic pressure bearing, liquid-solid two-phase flow, moving particles, flow field structure, computational fluid dynamics

CLC Number:

TG156

LIAO Guiwen, ZHANG Yi, WEI Kai, LIU Xiaojun, WANG Wei. Coupling Characteristics of Liquid-solid Two-phase Flow Field Structure and Particle Motion Behavior at Restricted Lubrication Interface[J]. Journal of Mechanical Engineering, 2024, 60(20): 351-360.

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