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Energies 2017, 10(5), 662; doi:10.3390/en10050662

Experimental Study on the Influence of the Rotating Cylinder Block and Pistons on Churning Losses in Axial Piston Pumps

1
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Zheda Road 38, Hangzhou 310027, China
2
Department of Mechanical Engineering, University of Bath, Bath BA2 7AY, UK
*
Author to whom correspondence should be addressed.
Academic Editor: Andrea Vacca
Received: 20 March 2017 / Revised: 28 April 2017 / Accepted: 8 May 2017 / Published: 10 May 2017
(This article belongs to the Special Issue Energy Efficiency and Controllability of Fluid Power Systems)
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Abstract

Pressure and performance requirements of axial piston pumps and the proportion of churning losses in axial piston pumps increase significantly with increasing speed. To investigate the primary distribution of churning losses in axial piston pumps at various ranges of speed, a test rig was set up in which other friction losses can be eliminated, thus making it possible to investigate the net churning losses in an axial piston pump. The influence of the rotating cylinder block and pistons on churning losses is analyzed based on a qualitative evaluation of the various fluid flow regimes at different test speeds in an axial piston pump. The analytical results indicate that pistons have less influence on churning losses than the rotating cylinder block beyond the critical speed in axial piston pumps, because the total energy dissipation transforms laminar viscous friction losses into turbulent shear stress losses. It is concluded that more attention should be given to the effect of the rotating cylinder block on churning losses in axial piston pumps at high rotation speed. View Full-Text
Keywords: axial piston pumps; churning losses; rotating cylinder block; pistons; experimental study axial piston pumps; churning losses; rotating cylinder block; pistons; experimental study
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MDPI and ACS Style

Zhang, J.; Li, Y.; Xu, B.; Pan, M.; Lv, F. Experimental Study on the Influence of the Rotating Cylinder Block and Pistons on Churning Losses in Axial Piston Pumps. Energies 2017, 10, 662.

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