The Flow Dynamics Of An Air-Driven Hydraulic Pump

Y Shi, Tiecheng Wu, Andrew Plummer

Research output: Chapter or section in a book/report/conference proceedingChapter in a published conference proceeding


Air-driven hydraulic pumps are widely used to pump highpressure
oil for small hydraulic systems, where it is
uneconomic to set up a conventional hydraulic power pack. To
obtain good performance of a small hydraulic system, input air
flow and output oil flow characteristics of the air-driven
hydraulic pump should be properly understood. In this paper,
based on a mathematical model which has been experimentally
verified, the model of an air-driven hydraulic pump is
proposed. Using the software MATLAB/Simulink for
simulation, the dynamic characteristics of the pumps are
obtained. To set a foundation for the optimization of the pump,
the influence of key parameters on the output characteristics of
the pump was studied. Through analysis, it can be obtained
that, firstly, with an increase in the input air pressure, output oil
pressure and area ratio, the ratio of output to input volume flow
rate decrease approximately linearly. Moreover, when the
output oil pressure was fixed, an energy-saving method to
enhance the output oil flow is to enlarge the area ratio of the
pump. Furthermore, the output oil flow can be increased
rapidly through increasing the input air pressure, but that may
result in an increase in compressed air consumption. This
research is of use in the performance and design optimization
of air-driven hydraulic pumps.
Original languageEnglish
Title of host publicationProceedings of the ASME/BATH 2015 Symposium on Fluid Power and Motion Control
Publication statusPublished - Oct 2015
EventASME/Bath Symposium on Fluid Power and Motion Control - Chicago, USA United States
Duration: 12 Oct 201514 Oct 2015


ConferenceASME/Bath Symposium on Fluid Power and Motion Control
Country/TerritoryUSA United States


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