基于CFD的均布圆形微孔活塞环数值分析
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摘要
建立了基于CFD的均布圆形微孔活塞环的流体模型,研究了在一定工况下圆形微孔活塞环间隙的压力分布规律,以及圆形微孔的孔深hp和开孔比SP对活塞环间隙的流量Q、承载力Fo和摩擦力Ff的影响。结果表明,hp取3～5μm之间时,活塞环间隙有较大流量,可以改善润滑效果。hp较小时选用较小SP,hp较大时选用较大SP可获得较大承载力;若欲减小摩擦,需选用较大SP。
A CFD based model was developed for the piston ring with uniform circular micro-pores. At different working conditions, the pressure distribution of clearance flow was studied, and the effects of pore depth hp and area ratio SP on the clearance flux, load carrying capacity Fo and friction force Ff were also discussed. The results showed that when hp is between 3 and 5 microns, the flux of the clearance and the lubrication effect are increased. In order to increase Fo, it is better to select small SP when hp is small, and select big SP when hp is big.In order to reduce friction, it is better to select big SP.
A CFD based model was developed for the piston ring with uniform circular micro-pores. At different working conditions, the pressure distribution of clearance flow was studied, and the effects of pore depth hp and area ratio SP on the clearance flux, load carrying capacity Fo and friction force Ff were also discussed. The results showed that when hp is between 3 and 5 microns, the flux of the clearance and the lubrication effect are increased. In order to increase Fo, it is better to select small SP when hp is small, and select big SP when hp is big.In order to reduce friction, it is better to select big SP.
引文
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[2]Ronen A.,Etsion I.Friction-reducing Surface-Texturing in reciprocating automotive components[J].Tribology Transactions,2001(44):359-366.
[3]Bolander N.W.Piston ring lubrication and friction reduction through surface modification[D].Indiana:Purdue University,2007.
[4]于海武,王晓雷,孙造,袁思欢.圆柱形微凹坑表面织构对流体动压润滑性能的影响[J],南京航空航天大学学报,2010,42(2):209-213.
[5]Gonzalo Brito Gadeschi,Katja Backhaus,Gunther Knoll.Numerical Analysis of Laser-Textured Piston-Rings in the Hydrodynamic Lubrication Regime[J].Journal of Tribology,2012(134):1-8.
[6]苗嘉智,郭智威,袁成清.表面织构对内燃机缸套─活塞环系统摩擦性能的影响[J].摩擦学学报,2017,37(4):465-471.
[7]V.Ezhilmaran,N.J.Vasa,L.Vijayaraghavan.Investigation on generation of laser assisted dimples on piston ring surface and influence of dimple parameters on friction[J].Surface&Coatings Technology,2018(335):314-326.
[8]T.Ibatan,M.S.Uddina,M.A.K.Chowdhury.Recent development on surface texturing in enhancing tribological performance of bearing sliders[J].Surface and Coatings Technology,2015(6):102-120.
[9]李周裕.基于空穴理论的内湾及典型摩擦副摩擦润滑研究[D].天津:天津大学,2012.
[10]M.Fowell,A.V.Olver,A.D.Gosman,H.A.Spikes,I.Pegg.Entrainment and Inlet Suction:Two Mechanisms of Hydrodynamic Lubrication in Textured Bearings[J].Journal of Tribology,2007(129):336-347.