Churning And Friction Power Loss And Cavitation Analysis Of High-speed Axial Piston Pump

The study object of this article is the high-speed axial piston pump.With the modern industry’s need for high-speed piston pumps,the study on high-speed axial piston pumps is of great significance.As the rotation speed of the plunger pump increases,the loss of stirring power and cavitation will become more and more significant.Therefore,this paper mainly studies the power loss and cavitation of high-speed axial piston pumps.For the study of stirring loss,a mathematical model has been established and studied its influencing factors.However,the influence of the pressure difference resistance caused by the rotating stirring flow field of the plunger on the churning loss has not been considered,and the state of the internal flow field has not been studied.With the increase of the speed of the plunger pump,the differential pressure resistance will also greatly increase,and the turbulence in the flow field will become more and more obvious.Therefore,this paper will establish a mathematical model including influencing factors such as differential pressure resistance to further improve the accuracy of the churning loss model.At the same time,this paper also analyzes the turbulence in the internal flow field of the high-speed rotary plunger pump,and conducts in-depth research on the factors that affect the stirring loss of the plunger pump.The stirring flow field in the plunger pump mainly includes two parts: the plunger stirring flow field between the part of the plunger protruding from the cylinder and the inner wall of the cylinder,and the stirring flow field of the cylinder between the outer wall of the cylinder and the inner wall of the casing.Impact of cylinder speed,number of plungers,and swash plate inclination on churning loss in the stirring flow field has been discussed: When the plunger pump rotates at high speed,the loss of stirring power is very significant;the frictional power loss of the Slipper Pair and the Port Plate/Cylinder Block Frictional Pair is also the very important part of the power loss in the high speed plunger pump,by adopting the bionic non-smooth surface of cylinder contact surface in the Port Plate/Cylinder Block Frictional Pair,the frictional power loss of the Port Plate/Cylinder Block Frictional Pair can be effectively reduced.With the increase of the speed of the piston pump,not only the power loss is getting larger,but the cavitation of the pump is becoming more and more serious.A full fluid domain model of the plunger pump is established to analyze the distribution and generation mechanism of cavitation regions of the oil inlet,Port Plate/Cylinder Block Frictional Pair,Cylinder waist groove,and piston chamber of the high-speed axial piston pump.Based on the analysis of the distribution and production mechanism of the whole cavitation of the pump,the effects of pump speed,load pressure,and swash plate inclination on the cavitation degree of each part of the pump are studied.Based on the above analysis,Cylinder waist groove is inclined at a certain angle and the inlet pressure is increased to reduce the degree of cavitation of each component in the pump.