Experimental Investigation on Elastohydrodynamic Lubrication Characteristics under Discrete Oil Droplet Supply
Under limited lubricant supply conditions,a thin lubricating oil layer on the lubrication track tends to form discrete oil droplets,directly affecting the lubrication performance.In order to explore the influence of oil droplet spreading and merging behavior on lubrication characteristics,a micro-feeding device was utilized to supply discrete oil droplets.A specially-designed optical interferometry lubricating film thickness test rig was used to observe the lubrication of multiple micro oil drops.Combined with the transportation speed of oil drops,the effects of oil viscosity,droplet size,droplet spacing and distribution position on the film thickness of lubricating oil were explored.It is found that the spreading and merging behaviors of oil droplets at the contact area inlet have a significant influence on the synergistic lubrication effect.Insuffi-cient droplet size,excessive spacing,high entrainment speed,or high oil viscosity hinder the formation of a complete oil film,thereby weakening lubrication effect.Increasing droplet size can effectively improve lubrication effect,however,exces-sively large droplets can lead to increased detour flow and reduce lubrication efficiency.Under conditions where lubricant supply is limited,the film-forming ability of discrete droplet oil supply,optimized through distribution parameters,is found to be superior to that of single oil supply with the same quantity of oil.Experimental results indicate that the film thickness of discrete droplet oil supply is four times greater than that of single oil supply with an equivalent amount of oil.
limited lubricant supplydiscrete oil dropletspreading and merging effectslubrication efficiencydistribu-tion parameter
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