The simulation of asymmetric micro-textures on the lubrication characteristics of sliding friction pairs

29th IAHR Symposium on Hydraulic Machinery and Systems

Liu, Dong-Ni^1 ; Yan, Zhi-Jun^1 ; Yan, Xue-Liang^1 ; Fang, Xun^1 ; Zhu, Xin-He^1 ; Cheng, Dong^1 ; Xue, Cheng^2

Marine Engineering College, Dalian Maritime University, Dalian, Liaoning

116026, China^1

Xihua University, Key Laboratory of Fluid and Power Machinery, Ministry of Education, School of Energy and Power Engineering, China^2

关键词: Asymmetric cross section;    Distribution characteristics;    Friction coefficients;    High pressure regions;    Lubrication characteristics;    Morphology parameters;    Sliding friction pairs;    Theoretical modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/240/6/062019/pdf
DOI  :  10.1088/1755-1315/240/6/062019

来源: IOP

【 摘 要 】

In order to study the effects of micro-texture lubrication characteristics of sliding friction pairs with asymmetric cross section, a theoretical model based on the Navier-Stokes equations was established, and numerical simulations were performed to investigate the influence of the morphology parameters of asymmetric triangular micro-texture on the pressure distribution, cavitation contours, flow field, bearing capacity, friction coefficient etc. The results show that during friction process, a negative pressure and vortex region is formed inside the texture, and a high pressure zone is generated near the outlet of the texture. The morphology parameters of asymmetric micro-texture affect the magnitude of bearing capacity and friction coefficient by changing the distribution characteristics of pressure and vortex of the lubricant. With the increase of the slope at outlet of asymmetric triangular texture, the original vortex center gradually shifts downwards to the right; meanwhile, a prominent vortex region and a high pressure region are generated near the inlet of the texture. As a result of aforementioned redistribution of pressure and flow field, the bearing capacities gradually increase, while the friction coefficients continuously decline.