椭圆微孔截面形状对机械密封动力润滑性能的影响.pdf

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1、2014年12月润滑与密封Dec．2014第39卷第12期LUBRICATIONENGINEERINGVol

2、39No．12DOI：10．3969／j：issn．0254—0150．2014．012．016椭圆微孑L截面形状对机械密封动力润滑性能的影响程可石卓陆晓峰(南京工业大学机械与动力工程学院江苏南京211816)摘要：基于Navier—Stokes方程，建立单一椭圆型微孔端面不可压缩牛顿流体的三维CFD动力润滑模型，研究不同截面形状椭圆微孔机械密封的动力润滑性能，分析截面形状为矩形、梯形和三角形的椭圆微孔对端面液膜承载力

3、、摩擦力和摩擦因数的影响。结果表明：在微孔其他参数恒定情形下，微孔深度与端面间隙比值H<0．8时，矩形截面微孔的动力润滑性能占优，0．8≤日<1．8时梯形截面微孔的动力润滑性能占优，日≥1．8时三角形截面微孔的动力润滑性能最好；微孔倾斜角为45。时3种截面形状下都取得了最好的动力润滑性能，且梯形截面动力润滑性能最好；微孑L长宽比1．5≤y<2时梯形截面形状的微孔端面动力润滑性能最好，但当>2时矩形截面形状的微孑L端面动力润滑性能最好。关键词：机械密封；椭圆微孔；截面形状；动力润滑中图分类号：TB42文献标识码：A文章编号：02

4、54—0150(2014)12—080—6EfectofEllipseMicrodimpleSectiononHydrodynamicLubricationofMechanicalSealChengKeShiZhuoLuXiaofenfl(CollegeofMechanicalandPowerEngineering，NanjingTechnologyUniversity，NanjingJiangsu211816，China)Abstract：Athree-dimensionalhydrodynamiclubricationmo

5、deloftheincompressibleNewtonianfluidbetweentwosealfaceswithsinglemicrodimplewasbuiltbasedonthefullNavier-Stokesequation，thehydrodynamiclubricationofmechani-calsealsurfacewiththedifferentbottomshapesofellipsemicrodimplewasstudied，andtheeffectsofdifferentsections(rect

6、angular，trapezoidal，triangular)ofellipsemicrodimpleonload—carryingcapacity，frictionforceandfrictioncoefi-cientwereanalyzed．Theresultsshowthatundertheconditionoftheotherfactorswithconstantvalues，themicrodimplewithrectangularsectionhasthebestdynamiclubricationperforma

7、nceattheratioofmicrodimpledepthandendfaceclear—anceH<0．8，thetrapezoidalsectionisthebestchoicewhen0．8≤H<1．8，andthetriangularsectionispreferredforselectionatH≥1．8．Whenthemicrodimpleinclinationangle=45。．thedynamiclubricationperformancesgetoptimalvalueforallellipsemicro

8、dimpleswithdifferentsectionshapes．Furthermore，thetrapezoidalsectionmicrodimplehasabetterhydrodynamiclubricationperformancecomparedtotheothersectionmicrodimplesundertheconditionofdifferentinclinationangles．When1．5≤y<2(yistheratiooflengthandwidthofmicrodimple)，theelli

9、psemicrodimplewithtrapezoidalsectionhasthebestdynamiclubricationperformance，buttherectangularsectionellipsemicrodimpleisthebestaty>2．Keywo