Research on leakage characteristic of slipper pair of aviation piston pump considering viscosity temperature and pressure effect

In order to improve the sealing performance, work efficiency and service life of the piston pump, the leakage is increased due to the relative motion between the slipper pair and swash plate under high speed and high pressure conditions. Numerical simulation is carried out jointly with AMEsim and ANSYS Fluent, and the Realizable k-ε turbulence model is adopted to study the leakage characteristics of flat slipper and slipper with auxiliary support under the viscosity temperature and pressure effect, considering the influence of temperature and pressure on lubricant viscosity, and the leakage variations in different rotational speeds are analyzed. The following conclusions can be drawn: for the two types of slipper with plane and auxiliary support, when the piston pump is in the oil suction stage, there is little difference in the leakage amount between the two types considering the viscosity temperature and pressure effect and the one without considering the viscosity temperature and pressure effect, and the leakage amount of the plane slipper is more obvious than that of the auxiliary support slipper in the oil suction stage. In the oil pressing stage, the leakage of the slipper pair increases with the increase of the rotational speed, and the leakage is larger when the viscosity temperature and pressure effect is considered. In this case, the leakage of the auxiliary support slipper is slightly larger than that of the flat slipper. When the rotation angle of the cylinder is in the range of 180°∼360°, the amplitude of the increase of the leakage is significantly greater than that of the rotation angle of 0°∼180°. This study can provide reference for the volumetric efficiency improvement of aviation piston pump.