螺旋槽旋转密封瞬态启停工况动态特性分析
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摘要
启停过程中旋转密封工作状态不稳定,其润滑性能对旋转密封的可靠性影响很大。通过耦合流体动压效应、挤压效应和粗糙峰接触特性,建立螺旋槽旋转密封摩擦动力学模型,计算瞬态启停工况时密封环的端面液膜厚度、粗糙峰承载力及泄漏量等润滑参量,分析螺旋槽旋转密封启停工况的瞬态行为。结果表明:在瞬态启停工况中,螺旋槽旋转密封有快速稳定的阶跃响应,在很短时间内能重新回到稳定工作状态;转速阶跃变化过程中,流体动压效应、挤压效应、流体动压效应先后成为影响螺旋槽旋转密封润滑特性的主要因素;外圆面摩擦力的存在有利于改善启停工况的润滑特性。
The operation status of rotary seal during startup and shutdown operations is unstable,so the lubrication performance of rotary seal greatly influences its reliability.A tribo-dynamic model of spiral groove rotary seal was developed through coupling hydrodynamic effects,squeeze effects and asperity contact properties.Lubrication characteristics,such as film thickness,asperity bearing force and leakage rate,etc.,were calculated.Transient behaviors of rotary seals during startup and shutdown operations were investigated.The results show that spiral groove rotary seal has fast and stable step response,and the seal ring can return stable operation in a short time.With step changes of speed,hydrodynamic,squeeze and hydrodynamic effects successively become significant factors in lubrication performance of rotary seal.It is also indicated that the circumference friction can improve lubrication performance during startup and shutdown operations.
The operation status of rotary seal during startup and shutdown operations is unstable,so the lubrication performance of rotary seal greatly influences its reliability.A tribo-dynamic model of spiral groove rotary seal was developed through coupling hydrodynamic effects,squeeze effects and asperity contact properties.Lubrication characteristics,such as film thickness,asperity bearing force and leakage rate,etc.,were calculated.Transient behaviors of rotary seals during startup and shutdown operations were investigated.The results show that spiral groove rotary seal has fast and stable step response,and the seal ring can return stable operation in a short time.With step changes of speed,hydrodynamic,squeeze and hydrodynamic effects successively become significant factors in lubrication performance of rotary seal.It is also indicated that the circumference friction can improve lubrication performance during startup and shutdown operations.
引文
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[2]赵一民,胡纪滨,吴维,等.螺旋槽旋转密封环润滑状态转变预测[J].机械工程学报,2013,49(9):75-80.ZHAO Y M,HU J B,WU W,et al.Prediction of lubrication condition transition for spiral groove rotary seal rings[J].Chinese Journal of Mechankcal Engineering,2013,49(9):75-80.
[3]宫燃,车华军,李洪武,等.等温密封环摩擦状态演变预测与试验研究[J].机械工程学报,2011,47(17):66-71.GONG R,CHE H J,LI H W,et al.Prediction and experimental research on evolution for frictional contact of isothermal sealing ring[J].Chinese Journal of Mechanical Engineering,2011,47(17):66-71.
[4]ZIRKELBACK N,SAN ANDRES L.Effect of frequency excitation on force coefficients of spiral groove gas seals[J].Journal of Tribology,1999,121(4):853-863.
[5]MILLER B A,GREEN I.Numerical techniques for computing rotordynamic properties of mechanical gas face seals[J].Journal of Tribology,2002,124(4):755-761.
[6]LIU R,WANG X,ZHANG X.Effects of gas rarefaction on dynamic characteristics of micro spiral-grooved thrust bearing[J].Journal of Tribology,2012,134(2):22201-1-7.
[7]GREEN I,BARNSBY R M.A simultaneous numerical solution for the lubrication and dynamic stability of noncontacting gas face seals[J].Journal of Tribology,2001,123(2):388-394.
[8]MILLER B A,GREEN I.Numerical formulation for the dynamic analysis of spiral-grooved gas face seals[J].Journal of Tribology,2001,123(2):395-403.
[9]YU T H,SADEGHI F.Groove effects on thrust washer lubrication[J].Journal of Tribology,2001,123(2):295-304.
[10]KAWABATA N.A study on the numerical analysis of fluid film lubrication by the boundary-fitted coordinates system:fundamental equations of df method and the case of incompressible lubrication[J].JSME International Journal.Ser.3,Vibration,Control Engineering,Engineering for Industry,1988,31(1):107-113.
[11]CHANG W R,ETSION I,BOGY D B.An elastic-plastic model for the contact of rough surfaces[J].Journal of Tribology,1987,109(2):257-263.
[12]JACKSON R L,GREEN I.A finite element study of elasto-plastic hemispherical contact against a rigid flat[J].Journal of Tribology,2005,127(2):343-354.
[13]MCCOOL J I.Comparison of models for the contact of rough surfaces[J].Wear,1986,107(1):37-60.
[14]SHAMPINE L F.Numerical solution of ordinary differential equations[M].New York:Chapmanand Hall,1994.
[15]SHAMPINE L F,REICHELT M W.The Matlab ode suite[J].Journal on Scientific Computing,1997,18(1):1-22.
[16]QIU Y,KHONSARI M M.Investigation of tribological behaviors of annular rings with spiral groove[J].Tribology International,2011,44(12):1610-1619.