Study on influence of surface texture on lubrication characteristics of liquid sodium hybrid plain bearing
As the secondary loop main circulation pumps progress towards larger capacity and higher loads,higher requirements are placed on the lubrication characteristics of its key load-bearing component,which is the liquid sodium hybrid plain bearing(referred to as liquid sodium bearing).To further improve the lubrication characteristics of liquid sodium bearing,the influence of surface texture on its lubrication characteristics was studied through the combination method of numerical simulation and test.Firstly,the surface textures with circular,square and rhombic shapes were designed.After simplifying the friction pair model of liquid sodium bearing,the lubrication characteristics of three surface textures under different depths and different spacing were analyzed by numerical simulation method.Then,the influence of laser processing parameters on the surface texture preparation was explored,and the friction pair specimens with surface textures of different shapes and different spacing were prepared for friction and wear testing.Finally,the liquid sodium bearing model incorporating surface textures was analyzed.The results indicated that the surface textures with different shapes had optimal depth and spacing,and the rhombic texture had the best lubrication characteristics when the dimensionless depth was 2 and the spacing was 1.4 mm.After incorporating rhombic textures,the bearing capacity and stiffness coefficient of liquid sodium bearing increased by 16.7%and 9.3%,respectively,and the friction coefficient decreased by 13.1%.The research results are of great significance for the safe and reliable operation of secondary loop main circulation pumps and sodium-cooled fast reactor systems,and can provide important reference for the optimization design and localization of similar bearings.
liquid sodium hybrid plain bearingsurface texturefriction and wearlubrication characteristics