Simulation Of Flow Filed For Axial Piston Pump Cylinder Block-valve Plate Interface And Parameters Characteristic Analysis Of Triangular Relief Groove

Because of its unique advantages, Axial piston pump are widely used in theindustrial development process, with the voice of energy saving getting high, axialpiston pump’s development have been blocked due to its big noise under operation,Domestic axial piston pump products are suffering monopoly of foreign high-performance products for delayed domestic research to axial piston pump, whichhave seriously restricted the development of domestic relate industries of machinery.Flow noise and structural vibration noise are the main noise of axial piston pump,both of which are intrinsically linked with the dynamic flow field of cylinder block-valve plate interface. In this paper, the characteristic of dynamic flow field ofcylinder block-valve plate interface been studied combining theory with CFDsimulation method, the influence of slope triangular relief groove structuralparameters on flow noise and structural vibration noise is analyzed, which canprovide reference for the design of high performance and low noise axial pistonpump and have important significance for enhancing the competitiveness ofdomestic axial piston pump products.Passage section area function between piston chamber and valve plate kidneyport is derived by theoretical methods, the temporal pressure characteristics ofdifferential equation of piston chamber is established, numerical model of filmpressure distribution of cylinder block-valve plate interface is set up. According tothe temporal pressure equation of piston chamber and film pressure distribution ofcylinder block-valve plate interface, the stability forces model of cylinder is found.The influence of Spindle speed and film thickness to film pressure distribution isresearched.Fluid domain parametric geometry model of axial piston pump is built byextract piston pump’s flow cavity. High quality fluid finite element mesh parametersof axial piston pump are established using local parameter control and gridassembly function of ICEM. Simulation parameters are selected by accuratejudgment of the critical fluid domain flow state of axial piston pump, at the last, Aperfect CFD simulation model of axial piston pump is established with UDF (usersubroutine) used to simulate the movement of piston.Noise characteristics of flow pulsation, pressure pulsation, and force stabilityof cylinder block and dynamic characteristic of film are studied. The result of CFDsimulation and theoretical were compared and analyzed. The influence of operationparameters to the noise characteristic of axial piston pump is studied by CFDsimulation. In given conditions, a reasonable proposal to design structural parameters of triangular relief groove is put forward by simulation of the effect oftriangular relief groove structural parameters to the performance of axial pistonpump.