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The Influence of Radial and Axial Gaps on Volumetric Efficiency of External Gear Pumps

Author

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  • Paulina Szwemin

    (Department of Off-Road Machine and Vehicle Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland)

  • Wieslaw Fiebig

    (Department of Off-Road Machine and Vehicle Engineering, Faculty of Mechanical Engineering, Wroclaw University of Science and Technology, 50-371 Wroclaw, Poland)

Abstract

The design of gear pumps and motors is focused on more efficient units which are possible to achieve using advanced numerical simulation techniques. The flow that appears inside the gear pump is very complex, despite the simple design of the pump itself. The identification of fluid flow phenomena in areas inside the pump, considering the entire range of operating parameters, is a major challenge. This paper presents the results of simulation studies of leakages in axial and radial gaps in an external gear pump carried out for different gap shapes and sizes, as well as various operating parameters. To investigate the processes that affect pump efficiency and visualize the fluid flow phenomena during the pump’s operation, a CFD model was built. It allows for a detailed analysis of the impact of the gears’ eccentricity on leakages and pressure build-up on the circumference. Performed simulations made it possible to indicate the relationship between leakages resulting from the axial and radial gap, which has not been presented so far. To verify the CFD model, experimental investigations on the volumetric efficiency of the external gear pump were carried out. Good convergence of results was obtained; therefore, the presented CFD model is a universal tool in the study of flow inside external gear pumps.

Suggested Citation

  • Paulina Szwemin & Wieslaw Fiebig, 2021. "The Influence of Radial and Axial Gaps on Volumetric Efficiency of External Gear Pumps," Energies, MDPI, vol. 14(15), pages 1-21, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:15:p:4468-:d:600475
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    References listed on IDEAS

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    1. Emma Frosina & Adolfo Senatore & Manuel Rigosi, 2017. "Study of a High-Pressure External Gear Pump with a Computational Fluid Dynamic Modeling Approach," Energies, MDPI, vol. 10(8), pages 1-20, July.
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    Cited by:

    1. Ornella Chiavola & Edoardo Frattini & Fulvio Palmieri & Ambra Fioravanti & Pietro Marani, 2023. "On the Efficiency of Mobile Hydraulic Power Packs Operating with New and Aged Eco-Friendly Fluids," Energies, MDPI, vol. 16(15), pages 1-16, July.

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