深槽表面涡流效应对气体润滑流量特性的影响
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摘要
采用基于NS方程的CFD方法,开展二维矩形槽单元结构微米间隙气体润滑流量特性研究,讨论Reynolds方程的有效性。数值计算剪切流和压差流工况涡流随槽深的变化规律,对比分析压力和剪切速度对流量特性的影响规律。结果表明,槽深影响涡流效应的强度,在小槽深时,涡流效应对气体润滑的流量特性的影响可以忽略,Reynolds方程适用于分析气体润滑密封性能;随着槽深增加,涡流效应对流量影响较大,Reynolds方程的计算偏差增加。
Flow characteristics of gas lubrication were studied for a two dimension micrometer clearance with rectangle groove unit.CFD method based on NS equations was used to calculate pressure distribution and flow rate for both pressure flow and shear flow.Influence of vortex effect on flow rate as well as validity of Reynolds equation was discussed.Numerical results show that development of vortex strongly depends on groove depths.Vortex effect on flow characteristic can be ignored and Reynolds equation method can ensure good accuracy at shallow groove depths.With increasing groove depth,vortex effect becomes significant and the accuracy of Reynolds equation declines.
Flow characteristics of gas lubrication were studied for a two dimension micrometer clearance with rectangle groove unit.CFD method based on NS equations was used to calculate pressure distribution and flow rate for both pressure flow and shear flow.Influence of vortex effect on flow rate as well as validity of Reynolds equation was discussed.Numerical results show that development of vortex strongly depends on groove depths.Vortex effect on flow characteristic can be ignored and Reynolds equation method can ensure good accuracy at shallow groove depths.With increasing groove depth,vortex effect becomes significant and the accuracy of Reynolds equation declines.
引文
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[2]Li Jun,Kong Shengru,Yan Xin,et al.Numerical investigationson leakage performance of the rotating labyrinth honeycombseal[J].ASME J Eng Gas Turbines Power,2010,132(6):062501.
[3]李金波,何立东.蜂窝密封流场旋涡能量耗散的数值研究[J].中国电机工程学报,2007,27(32):67-71.Li Jinbo,He Lidong.Energy dissipation of vortexs in honeycombseals using numerical simulation[J].Proceedings of the Chi-nese Society of Electrical Engineering,2007,27(32):67-71.
[4]Untarolu A,Houston G,Migliorini P,et al.Hole-pattern seals:Athree dimensional CFD approach for computing rotordynamiccoefficient and leakage characteristics[C]//Proceeding of2009 ASME International Mechanical Engineering Congress andExposition,Florida,2010:981-990.
[5]温诗铸,黄平.摩擦学原理[M].3版.北京:清华大学出版社,2008.
[6]Sahlin F,Glavatskih S B,Almqvist T,et al.Two-dimensionalCFD-analysis of micro-patterned surfaces in hydrodynamic lu-brication[J].ASME J Tribol,2005,127:96-102.
[7]Arghir M,Roucou N,Helene M,et al.Theoretical analysis ofthe incompressible laminar flow in a macro-roughness cell[J].ASME J Tribol,2003,125:309-318.
[8]Guardino C,Chew J W,Hills N J.Calculation of surface rough-ness effects on air-riding seals[J].ASME J Eng Gas TurbinesPower,2006,126(1):75-82.
[9]Bai Shaoxian,Peng Xudong,Li Yefeng.Gas lubrication analy-sis method of step-dimpled face mechanical seals[J].ASME JTribol,2012,134:011702.