Design of bionic non-smooth fan-shaped concave surface based on hydrodynamic lubrication

Fan-shaped concave were arranged on the slipper-pad surface of seawater axial piston pump, and a hydrodynamic lubrication model of slipper/swash-plate pair was established. The CFD method was employed to investigate the effect of geometric parameters of concave on the hydrodynamic lubrication performance and the load carrying capacity of seawater film. The research results show that the positive pressure area could be enlarged by the arc of fan-shaped concave and the negative pressure area could be controlled by the central angle, so the hydrodynamic lubrication effect is excellent; the load carrying capacity of seawater film could be improved by the conical bottom making better use of wedge effect, and the load carrying capacity curve first increases and then decreases when the bottom peak moved from center to arc of the fan along the direction of velocity with the maximum 0.386 N at the chord; the load carrying capacity is presented as sinusoidal curve when the central angle was from 30°to 150°, which has minimum 0.369 N at 60° and maximum 0.386 N at 120°. The research results of this paper would provide reference for the further study of slipper with bionic non-smooth surface of high pressure seawater axial piston pump.