轴向柱塞泵流量脉动成因及成分数值仿真分析OA北大核心

Flow pulsation is an inherent property of the delivery oil of axial piston pumps.The pressure pulsation induced by flow pulsation affects the working quality and service life of axial piston pumps and even the entire hydraulic system.To clarify the causes and components of flow pulsation,a three-dimensional transient CFD model of an axial piston pump is established,a test platform for pressure pulsation at the outlet of an axial piston pump is built to verify the numerical model experimentally.In addition,the pressure pulsation components due to geometric pulsation,backflow pulsation,leakage pulsation and dead zone pulsation are obtained by adjusting the geometrical structure parameters of the simulation model.The verified simulation model is employed to analyze the amplitude contributions of each flow pulsation component under different operating conditions.The simulation results indicate that geometric pulsation and backflow pulsation have positive contributions to the flow pulsation,while leakage pulsation and dead zone pulsation have negative contributions to the flow pulsation.The geometric pulsation,backflow pulsation,dead zone pulsation,and leakage pulsation account for 9％,214％,-35％and-88％,respectively,of the total delivery flow pulsation at a discharge pressure of 10 MPa and a rotational speed of 1000 r/min.The research results provide an important theoretical basis for the formation mechanism and suppression methods of the delivery flow pulsation in axial piston pumps.