Abstract: Slipper pair is one of the most important frictional pairs of hydraulic axial ram pump, which is supported by static pressure to facilitate good lubricating. The fluid in the slipper pair was analyzed by using Reynolds number. The length when the flow in plunger damping hole was turbulence was shorter than that when it was laminar. To reduce the leak and prove the performance of slipper, the moisture film of sealing strip should be laminar. The flow distribution of slipper pair was analyzed by FLUENT after the model of moisture film was created. The distribution of pressure and velocity in the flow was based on different pressure and fluid properties. The area where the pressure was even and maximum was the main area which bore the pressure. The pressure of the moisture film reduced gradually along the radius. The velocity of flow nearby the centrality of the hydrocoel was faster then the centrality of the oil reservoir. It was advanced with the growth of the pressure. Some theories could be evidenced for designing the slipper pair.

Key words: slipper pair, moisture film, FLUENT, flow distribution