表面织构活塞环与CuO纳米润滑油协同润滑特性数值研究
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摘要
建立了活塞环-缸套流体动压润滑数值模型,研究表面织构和CuO纳米润滑油对活塞环协同润滑机理。研究结果表明:CuO纳米润滑油能有效减小粗糙接触力,降低磨损,但会引起流体黏性剪切力增加;活塞环织构表面与缸套之间形成的微动压效应对动压润滑有促进作用,能有效减小流体摩擦力,减少摩擦损失,但在上下止点附近会导致粗糙接触力增加,磨损加剧;活塞环表面织构的位置会影响其摩擦性能,对比发现中间织构效果最好,与无织构活塞环相比能减小摩擦损失5.17%;表面织构和CuO纳米润滑油之间存在协同润滑作用,合适浓度的纳米润滑油和一定尺度的表面织构能在减少活塞环摩擦损失的同时降低磨损。本研究中中间织构活塞环和体积分数0.5%CuO纳米润滑油组成的协同润滑能达到最佳润滑性能。
A numerical model of ring-liner hydrodynamic lubrication was established to study the synergistic lubrication mechanism of surface texture and CuO nano-lubricant. The results show that CuO nano-lubricant can decrease asperity contact force and reduce wear, but will increase viscous shear force of fluid. The formed wedge-shaped oil film effect between the texture surface of the ring and the liner can promote the hydrodynamic lubrication and effectively reduce the hydrodynamic friction force and thereby reduces the friction loss.However, the asperity contact force increases and the wear intensifies near top and bottom dead centers. The position of surface texture forthe ring affects the tribological performance and the ring textured in the middle has the best effect, which can reduce the friction loss by 5.17% compared with the untextured ring. In addition, there is a synergistic lubrication effect between the surface texture and the CuO nano-lubricant.A suitable concentration of nano-lubricant and a certain scale of surface texture can reduce the friction loss and the wear of piston ring. In this research, the synergistic lubrication consisting of the ring textured in the middle and the nano-lubricant with 0.5% volume of CuO achieves the optimum lubrication performance.
A numerical model of ring-liner hydrodynamic lubrication was established to study the synergistic lubrication mechanism of surface texture and CuO nano-lubricant. The results show that CuO nano-lubricant can decrease asperity contact force and reduce wear, but will increase viscous shear force of fluid. The formed wedge-shaped oil film effect between the texture surface of the ring and the liner can promote the hydrodynamic lubrication and effectively reduce the hydrodynamic friction force and thereby reduces the friction loss.However, the asperity contact force increases and the wear intensifies near top and bottom dead centers. The position of surface texture forthe ring affects the tribological performance and the ring textured in the middle has the best effect, which can reduce the friction loss by 5.17% compared with the untextured ring. In addition, there is a synergistic lubrication effect between the surface texture and the CuO nano-lubricant.A suitable concentration of nano-lubricant and a certain scale of surface texture can reduce the friction loss and the wear of piston ring. In this research, the synergistic lubrication consisting of the ring textured in the middle and the nano-lubricant with 0.5% volume of CuO achieves the optimum lubrication performance.
引文
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[18] Greenwood J A,Tripp J H.The contact of two nominally flat rough surfaces[J].Proceedings of the Institution of Mechanical Engineers,1970,185:625-634.
[19] Patir N,Cheng H S.Application of average flow model to lubrication between rough sliding surfaces[J].Journal of Lubrication Technology,1979,101(2):220-229.
[20] Gulwadi S D.Analysis of Tribological Performance of a Piston Ring Pack[J].Tribology Transactions,2000,43(2):151-162.
[21] Gu C,Meng X,Xie Y,et al.A thermal mixed lubrication model to study the textured ring/liner conjunction[J].Tribology International,2016,101:178-193.
[2] Ronen A,Etsion I,Kligerman Y.Friction-reducing surface-texturing in reciprocating automotive components[J].Tribology Transactions,2001,44(3):359-366.
[3] Kligerman Y,Shinkarenko A,Etsion I.Improving tribo-logical performance of piston rings by partial surface texturing[J].Journal of Tribology,2005,127(3):632-638.
[4] Ryk G,Etsion I.Testing piston rings with partial laser surface texturing for friction reduction[J].Wear,2006,261(7):792-796.
[5] 钱双庆,朱荻,曲宁松.活塞环表面微坑电解加工技术的基础研究[J].内燃机学报,2010,28(2):173-179.
[6] Sorin-Cristian Vlǎdescu,Medina S,Olver A V,et al.Lubricant film thickness and friction force measurements in a laser surface textured reciprocating line contact simulating the piston ring-liner pairing[J].Tribology International,2016,98:317-329.
[7] Meng X,Gu C,Xie Y,et al.A two-dimensional starved lubrication analysis method for textured surfaces[J].International Journal of Engine Research,2016,17(10):1062-1076.
[8] Shen C,Khonsari M M.The effect of laser machined pockets on the lubrication of piston ring prototypes[J].Tribology International,2016,101:273-283.
[9] Hu C,Bai M,Lv J,et al.Molecular dynamics simulation on the friction properties of nanofluids confined by idealized surfaces[J].Tribology International,2014,78:152-159.
[10] 曹恒.活塞环-气缸套纳米润滑油流体润滑对流传热和润滑摩擦耦合的物理机制研究[D].大连:大连理工大学,2017.
[11] Wu Y Y,Tsui W C,Liu T C.Experimental analysis of tribological properties of lubricating oils with nanoparticle additives[J].Wear,2007,262(7):819-825.
[12] Ali M K A,Hou X,Mai L,et al.Improving the tribologi-cal characteristics of piston ring assembly in automotive engines using Al2O3 and TiO2,nanomaterials as nano-lubricant additives[J].Tribology International,2016,103:540-554.
[13] Patir N,Cheng H S.An average flow model for determining effects of three-dimensional roughness on partial hydrodynamic lubrication[J].Journal of Tribology,1978,100(1):12-17.
[14] 温诗铸,黄平.摩擦学原理[M].3版.北京:清华大学出版社,2008.
[15] Chen H,Ding Y,He Y,et al.Rheological behaviour of ethylene glycol based titaniananofluids[J].Chemical Physics Letters,2007,444(4-6):333-337.
[16] 温诗铸.弹性流体动力润滑[M].北京:清华大学出版社,1992.
[17] Pak B C,Cho,Y I.Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particle[J].Experimental Heat Transfer,1998,11(2):151-170.
[18] Greenwood J A,Tripp J H.The contact of two nominally flat rough surfaces[J].Proceedings of the Institution of Mechanical Engineers,1970,185:625-634.
[19] Patir N,Cheng H S.Application of average flow model to lubrication between rough sliding surfaces[J].Journal of Lubrication Technology,1979,101(2):220-229.
[20] Gulwadi S D.Analysis of Tribological Performance of a Piston Ring Pack[J].Tribology Transactions,2000,43(2):151-162.
[21] Gu C,Meng X,Xie Y,et al.A thermal mixed lubrication model to study the textured ring/liner conjunction[J].Tribology International,2016,101:178-193.
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