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Thermal Modelling of External Gear Machines and Experimental Validation

Author

Listed:
  • Rituraj Rituraj

    (Maha Fluid Power Research Center, Purdue University, Lafayette, IN 47905, USA)

  • Andrea Vacca

    (Maha Fluid Power Research Center, Purdue University, Lafayette, IN 47905, USA)

  • Mario Antonio Morselli

    (Stem Numerical Engineering, 41121 Modena, Italy)

Abstract

The flow of energy within external gear machines (EGMs) leads to the variation of fluid temperature in the EGMs, which affects their performance. However, the common approaches for the simulation of EGMs assume isothermal conditions. This isothermal assumption negatively impacts their modelling accuracy in terms of the internal flows which are dependent on the fluid temperature (via fluid properties). This paper presents a lumped parameter based thermal model of EGMs where the fluid temperature in the EGM is evaluated considering the effects of compression/expansion, internal flows, and power losses. Further, numerical techniques are developed to model each of these three aspects. The thermal model is validated via the outlet temperature and volumetric efficiency measurements obtained from experiments conducted on six units of an EGM taken as a reference with different internal clearances. The results from the model show that the fluid temperature increases as it is carried from the inlet side to the outlet side during the pumping operation. However, the fluid at the ends of the shafts has the highest temperature. By comparing the isothermal simulation results with the proposed thermal model, the results also point out how the isothermal assumption becomes inaccurate, particularly in conditions of low volumetric efficiency.

Suggested Citation

  • Rituraj Rituraj & Andrea Vacca & Mario Antonio Morselli, 2020. "Thermal Modelling of External Gear Machines and Experimental Validation," Energies, MDPI, vol. 13(11), pages 1-24, June.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:11:p:2920-:d:368243
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    Citations

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    Cited by:

    1. Gianluca Marinaro & Emma Frosina & Adolfo Senatore, 2021. "A Numerical Analysis of an Innovative Flow Ripple Reduction Method for External Gear Pumps," Energies, MDPI, vol. 14(2), pages 1-22, January.
    2. Gabriele Muzzioli & Luca Montorsi & Andrea Polito & Andrea Lucchi & Alessandro Sassi & Massimo Milani, 2021. "About the Influence of Eco-Friendly Fluids on the Performance of an External Gear Pump," Energies, MDPI, vol. 14(4), pages 1-26, February.
    3. Søren Ketelsen & Sebastian Michel & Torben O. Andersen & Morten Kjeld Ebbesen & Jürgen Weber & Lasse Schmidt, 2021. "Thermo-Hydraulic Modelling and Experimental Validation of an Electro-Hydraulic Compact Drive," Energies, MDPI, vol. 14(9), pages 1-29, April.
    4. Alessandro Corvaglia & Massimo Rundo & Paolo Casoli & Antonio Lettini, 2021. "Evaluation of Tooth Space Pressure and Incomplete Filling in External Gear Pumps by Means of Three-Dimensional CFD Simulations," Energies, MDPI, vol. 14(2), pages 1-16, January.

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