Analysis on hydrodynamic pressure-loading effect of port plate pairs with bionic non-smooth surface for sea water low-speed and high-torque hydraulic motor

With the CFD method and orthogonal experiment method, the hydrodynamic lubrication performance of port plate pairs with Bionic Non-smooth Surface has been analyzed. Under the condition of guaranteeing that the sum of all the pithead area surfaces is the same in different bionic non-smooth, full water flow deputy hydrodynamic lubrication models has been established. The effect of rotating speed, pit sectional shape and pithead diameter on hydrodynamic loading capacity with concave bionic non-smooth surfaces is explored. It concludes that the influence of the three factors are in turn as follows: rotating speed is more important than pithead diameter, and pithead diameter is more important than pit sectional shape. Bionic non-smooth surface is suitable for relatively high-speed conditions. Different sizes of pithead diameter have a great impact on pit hydrodynamic pressure-loading capacity. As pithead diameter increases, so does the load-carrying capacity of conical pit, cylinder pit, truncated-conic pit and spherical pit within limits. Among those pits, the pressure-loading capacity of bionic non-smooth surface with conical pit performs best when the pit diameter is 1.6mm. High pressure axial piston pump is widely applied in aircraft, to improve the loading capacity and anti-wear performance of the key tribopairs such swash plate/slipper, port plate/cylinder block and piston/cylinder block is very important for promoting the reliability and increasing service life of the axial piston pump. Bionic non-smooth surface effects studied and the method employed in this paper could be used in the investigation of the key tribopairs of high pressure axial piston pump used in aircraft.