Abstract
In the design of high pressure and high speed axial piston pump, grooves on piston are often used to improve the lubrication condition of piston-cylinder interface. However, the position and parameters of grooves are still depending on experience and experiment. A novel fluid structure interaction (FSI) model for the grooved piston-cylinder interface is formulated in this study, which aims to reveal the performance of oil film. Based on the kinematic analysis of piston, the instantaneous pressure of displacement chamber in piston pump is calculated. Reynolds equation is discretized and solved on the oil film mesh to obtain the pressure distribution of oil film. Eccentricities of piston center is iterated out with force balance loop. Influence method is used to calculate the deformation of both piston and cylinder. Six types of piston are introduced and compared in this study. Simulation results indicate that the grooves near displacement chamber can improve the trajectory of the micro motion of piston, which finally avoid contact between piston and cylinder and reduce viscous friction power loss. The grooves far from displacement chamber could store oil and reduce the leakage flow piston-cylinder interface.
Highlights
Axial piston pumps with wash plate design has extensively application in engineering machineries, aircraft hydraulic systems due to their advantages of high power density and efficiency.1,2 With the development of hydraulic technology towards high pressure, high speed and high reliability, the lubrication mechanism of axial piston needs to be revealed more clearly
A novel fluid structure interaction (FSI) model for the grooved piston-cylinder interface is formulated in this study, which aims to reveal the performance of oil film
Simulation results indicate that the grooves near displacement chamber can improve the trajectory of the micro motion of piston, which avoid contact between piston and cylinder and reduce viscous friction power loss
Summary
Axial piston pumps with wash plate design has extensively application in engineering machineries, aircraft hydraulic systems due to their advantages of high power density and efficiency. With the development of hydraulic technology towards high pressure, high speed and high reliability, the lubrication mechanism of axial piston needs to be revealed more clearly. This paper mainly focuses on the numerical model of the grooved piston-cylinder interface, which could provide theoretical guidance for the structural parameter design. Several researches has been done to reveal the lubrication mechanism of piston cylinder interface and improve its performance. Yamaguchi solved Reynolds equation on the oil film and analyzed the piston motion.. Harris studied the spin motion of piston and introduced its impact on the oil film.. With the development of computational fluid dynamics technology, more research focus on the numerical model of piston-cylinder interface. A numerical model of grooved piston-cylinder interface is established and the impact of grooves is analyzed in this study. Pelosi and Ivantysynova developed a fluid-structure interaction (FSI) model for piston-cylinder interface, which could solve and predict the performance of oil film, but the grooves on piston was II.
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