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Energies 2018, 11(7), 1842; https://doi.org/10.3390/en11071842

A Numerical Study on Influence of Temperature on Lubricant Film Characteristics of the Piston/Cylinder Interface in Axial Piston Pumps

1
School of Reliability and System Engineering, Beihang University, Beijing 100191, China
2
Sino-French Engineering School, Beihang University, Beijing 100191, China
3
Science and Technology on Reliability and Environmental Engineering Laboratory, Beihang University, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Received: 13 June 2018 / Revised: 6 July 2018 / Accepted: 12 July 2018 / Published: 13 July 2018
(This article belongs to the Special Issue Fluid Flow and Heat Transfer)
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Abstract

The loss of kinetic energy of moving parts due to viscous friction of lubricant causes the reduction of piston pump efficiency. The viscosity of lubricant film is mainly affected by the thermal effect. In order to improve energy efficiency of piston pump, this research presents a numerical method to analyze the lubricant film characteristics in axial piston pumps, considering the thermal effect by the coupled multi-disciplinary model, which includes the fluid flow field expressed by Reynolds equation, temperature field expressed by energy equation and heat transfer equation, kinematics expressed by the motion equation. The velocity and temperature distributions of the gap flow of piston/cylinder interface in steady state are firstly numerically computed. Then the distributions are validated by the experiment. Finally, by changing the thermal boundary condition, the influence of thermal effect on the lubricant film, the eccentricity and the contact time between the piston and cylinder are analyzed. Results show that with the increase of temperature, the contact time increases in the form of a hyperbolic tangent function, which will reduce the efficiency of the axial piston pump. There is a critical temperature beyond which the contact time will increase rapidly, thus this temperature is the considered as a key point for the temperature design. View Full-Text
Keywords: thermodynamic; numerical simulation; thermal effect; axial piston pumps thermodynamic; numerical simulation; thermal effect; axial piston pumps
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Song, Y.; Ma, J.; Zeng, S. A Numerical Study on Influence of Temperature on Lubricant Film Characteristics of the Piston/Cylinder Interface in Axial Piston Pumps. Energies 2018, 11, 1842.

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