表面织构排布方式对径向滑动轴承摩擦性能的影响

Effect of Surface Texture Arrangement on Friction Properties of Journal Bearing

基于Navier-Stokes方程,建立表面织构化滑动轴承数值分析模型,采用压力耦合方程的改进半隐式(SIMPLEC)算法进行求解,分析表面织构排布和形状对滑动轴承摩擦性能的影响。结果表明:在收敛楔入口排布十字形织构时可以显著提高承载能力;在收敛楔中部周向排布沟槽和短沟槽织构比轴向排布更能显著改善轴承摩擦性能,且排布倒椭圆、菱形和十字纹理可以更明显地改善滑动轴承的摩擦性能;在收敛楔出口排布织构不能改善滑动轴承的摩擦性能,而在发散楔只有三角形织构可以改善轴承的摩擦性能。设计5种新型复合织构排布方式,分析其对轴承摩擦性能的提升效果。结果发现:复合型织构比单一类型织构更有利于提高轴承摩擦性能,其中在收敛楔入口布置十字形织构,收敛楔中部分别布置周向沟槽、短沟槽和十字形织构,发散楔布置三角形织构的3种复合型织构设计轴承性能提升效果显著,使承载力分别提高了15.69%、15.66%和17.16%,摩擦因数降低了3.75%、4.17%和2.92%。

Based on Navier-Stokes equations,a numerical analysis model of surface textured journal bearing was established and was solved by the modified semi-implicit(SIMPLEC) algorithm of the pressure coupling equations.The effects of surface texture arrangement and surface shape on friction properties of journal bearings were analyzed.Five types of compound surface texture were proposed and designed,and their effects on bearing friction properties were comparatively analyzed.The results show that at the inlet area of convergence wedge,the cross textures can significantly improve the bearing capacity of the journal bearin.At the middle area of convergence wedge,the circumferential groove and short groove textures improve bearing friction properties more significantly than axial texture,and the friction properties of journal bearing can be improved more obviously when arranging the inverted ellipse,rhombus and cross textures.At the outlet area of convergence wedge,the textures cannot improve the friction properties of journal bearings,and at the divergence wedge area,only triangular texture can improve bearing friction properties.The compound textures can improve the friction properties of journal bearing more effectively than single type of texture.When cross texture are arranged the inlet area of convergence wedge,circumferential groove,short groove and cross texture are arranged respectively in the middle area of convergence wedge,triangular texture are arranged in the divergence wedge area,the bearing performance has a significant improvement.The bearing capacity of the bearings with these three types of compound textures is increased by 15.69%,15.66% and 17.16% respectively,and their friction coefficient is reduced by 3.75%,4.17% and 2.92% respectively.