Stochastic Models for Turbulent Lubrication of Rough Surfaces

doi:10.3901/JME.2019.09.071

Abstract

Abstract: Current turbulent lubrication analysis of rough bearing surfaces generally uses a turbulent lubrication model of an isotropic rough bearing surface. However, the scope of the model is too narrow and is not suitable for solving turbulent lubrication problems on rough bearing surfaces with directional characteristics. Based on the stochastic laminar lubrication theory of Christensen and the turbulent lubrication theory in the form of zero equation for journal bearings, stochastic turbulent lubrication theoretical models suitable for turbulent lubrication analysis of rough surface journal bearings are derived. The theoretical models consist of three parts:Stochastic turbulent lubrication theory model for one-dimensional longitudinal rough surface journal bearing, stochastic turbulent lubrication theory model for one-dimensional transverse rough surface journal bearing and stochastic turbulent lubrication model for isotropic rough surface journal bearing. The turbulent lubrication of the isotropic rough surface journal bearing is analyzed by the proposed stochastic turbulent lubrication model. And good agreement is obtained between the theoretical results and the corresponding experimental data. The proposed stochastic turbulent lubrication theoretical model can be conveniently applied to turbulent lubrication analysis of rough bearing surfaces with directional characteristics. Moreover, the theoretical models of stochastic turbulent lubrication are not only suitable for journal bearings, but also for turbulent lubrication research of friction pairs, such as sliders and thrust bearings.

Key words: hydrodynamic lubrication, rough surface, stochastic theory, turbulent flow

CLC Number:

TH117

ZHU Shaoyu, SUN Jun, LI Biao, ZHANG Xiao, MIAO Enming, REN Yanping, ZHU Guixiang. Stochastic Models for Turbulent Lubrication of Rough Surfaces[J]. Journal of Mechanical Engineering, 2019, 55(9): 71-79.

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