Hydrodynamic lubrication analysis of two-dimensional section between piston skirt and textured cylinder wall considering slip boundary conditions

Surface micro-texturing with slip boundary has attracted extensive attention. To accurately investigate the coupling influences of slip and micro-texturing on piston skirt lubrication performance, a comprehensive method called Reynolds-Stokes Galerkin finite element method (R-SGFEM) is proposed. Modified Reynolds equation is employed to calculate slip velocity by Navier slip model, and lubrication flow is solved by Stokes systems using the Galerkin finite element method. This method treats the slip boundary and recirculation in micro-textures skillfully, and is confirmed correct by designed experiments. The effects of slip length and geometric parameters are investigated and discussed. Results show that slip length and texture depth can reverse adjust pressure fluctuation of lubricant. The computing method of no-slip state of internal axial boundary is expressed.