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Mathematical model defining volumetric losses of hydraulic oil compression in a variable capacity displacement pump

Abstract

The objective of the work is to develop the capability of evaluating the volumetric losses of hydraulic oil compression in the working chambers of high pressure variable capacity displacement pump. Volumetric losses of oil compression must be determined as functions of the same parameters, which the volumetric losses due to leakage, resulting from the quality of design solution of the pump, are evaluated as dependent on and also as function of the oil aeration coefficient ε. A mathematical model has been developed describing the hydraulic oil compressibility coefficient klc|ΔpPi;bP;ε;v as a relation to the ratio ΔpPi/pn of indicated increase ΔpPi of pressure in the working chambers and the nominal pressure pn, to the pump capacity coefficient bP, to the oil aeration coefficient ε and to the ratio ν/νn of oil viscosity ν and reference viscosity νn. A mathematical model is presented of volumetric losses qPVc|ΔpPi;bP;ε;v of hydraulic oil compression in the pump working chambers in the form allowing to use it in the model of power of losses and energy efficiency. 

Keywords:

hydrostatic drive, variable capacity displacement pump, volumetric losses of oil compression, mathematical model

Details

Issue
Vol. 21 No. 4(84) (2014)
Section
Latest Articles
Published
31-01-2015
DOI:
https://doi.org/10.2478/pomr-2014-0045
Licencja:
Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Open Access License

This journal provides immediate open access to its content under the Creative Commons BY 4.0 license. Authors who publish with this journal retain all copyrights and agree to the terms of the CC BY 4.0 license.

 

Author Biography

Zygmunt Paszota,
Gdansk University of Technology, Faculty of Ocean Engineering and Ship Technology



Authors

Zygmunt Paszota

Gdansk University of Technology, Faculty of Ocean Engineering and Ship Technology

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