Presenting a Mathematical Model for Determining the Efficiency of the Fixed Displacement Radial Piston Pump

Author

Assist Prof, Department of Mechanical Engineering, Jundi-Shapur University of Technology, Dezful, Iran.

10.22044/jsfm.2025.15818.3942

Abstract

It is necessary to predict the efficiency of radial piston pumps in different working conditions, in order to optimize energy consumption in power transmission systems of mobile machines. In this article, a mathematical model was presented to estimate the efficiency of the fixed displacement radial piston pump under different working conditions. To evaluate the accuracy of this mathematical model, a flow generation unit, including a radial piston pump and various sensors, was designed and built for the measurement volumetric, mechanical, and total efficiencies, pump flow rate, and input shaft torque. The studies showed that the average difference between the results of experimental measurements of volumetric, mechanical, and total efficiencies and the results of solving the mathematical model are less than 3.5, 3.8, and 4.5%, respectively. The trend of changes in volumetric and total efficiencies of the pump according to the rotational speed of its axis, includes a "dead zone" that expands with the increase of pressure at the pump port. Also, increasing pressure in the outlet of the pump increases the speed corresponding to maximum overall efficiency. However, the mechanical efficiency of the pump shows minimal variation in response to changes in the input shaft's speed and oil pressure.

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References

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Journal of Solid and Fluid Mechanics
Volume 15, Issue 2
May and June 2025
Pages 51-64

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