Study On Cavitation Characteristics Of Oil Suction Channel And Plunger Cavity In High Speed Axial Piston Pump

High speed axial piston pump is widely used in aerospace field because of its small size and high power/weight ratio,and plays an important role in the operation and control of aircraft hydraulic system.However,with the increase of the speed of the plunger pump,the oil absorption capacity is insufficient,and the internal cavitation phenomenon is more and more serious,which has become one of the important factors limiting the speed increase of the plunger pump.Therefore,the mechanism of cavitation phenomenon in high-speed plunger pump is analyzed,the flow field simulation model of the plunger pump is established,and the structure of the plunger pump is optimized,so as to reduce the cavitation phenomenon in the pump,which is conducive to further breaking through the speed limit of the plunger pump.This paper takes high-speed axial piston pump as the research object,studies the relationship between suction pressure and cavitation phenomenon,analyzes the minimum suction pressure and maximum speed of the piston pump cavitation phenomenon.The simulation model of high-speed axial piston pump is established,and the cavitation distribution in pump oil suction channel and plunger cavity is studied.The causes of cavitation are analyzed qualitatively and quantitatively,and the influence of changing oil suction pressure on cavitation and cavitation is studied.The influence of changing the suction pressure on the output flow and volumetric efficiency of the pump is tested and compared with the simulation data under the same working condition to verify the accuracy of the simulation results.In view of the cavitation phenomenon in the suction channel and the plunger cavity of the high-speed axial piston pump,the anti-cavitation structure optimization design is carried out,which mainly included changing the width angle of the longitudinal section and the depth angle of the transverse section of the triangular damping groove of the valve plate,and the combination form of the hole groove.In order to improve the local pressure loss caused by the flow path structure in the process of oil absorption,the structure optimization design of the pump oil absorption channel is carried out and its anti-cavitation performance is verified.