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Evaluating performances of 1-D models to predict variable area supersonic gas ejector performances

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  • Petrovic, Andrija
  • Jovanovic, Milos Z.
  • Genic, Srbislav
  • Bugaric, Ugljesa
  • Delibasic, Boris

Abstract

The application of supersonic gas ejector with variable area nozzle can be found in different industries. However, due to different types of variable area nozzle, performance prediction is mainly focused on costly numerical simulations. In this paper, one-dimensional models for performance prediction of variable area gas ejector with specially designed nozzle, were compared. Additionally, operational lines and corresponding modes were analyzed. Two different variable area ejectors were experimentally tested. The first ejector used natural gas as motive fluid, whereas in the second one motive gas was the composition of alkane. Six distinct correlations of ejector component efficiencies were evaluated. Sum of absolute relative errors and coefficient of determination were used as goodness of fit criteria. The results showed that best model has coefficient of determination 0.76 and 0.63 in the case of natural and R2 gas as motive fluids, respectively. In order to improve prediction performances of entrainment ratio, the mixture of experts machine learning technique was used. Moreover, the results of obtained conditional probabilities of models are visualized in space spanned by area and pressure ratios. The presented analysis showed that one model is not generally better than others and can be improved by using an ensemble of models.

Suggested Citation

  • Petrovic, Andrija & Jovanovic, Milos Z. & Genic, Srbislav & Bugaric, Ugljesa & Delibasic, Boris, 2018. "Evaluating performances of 1-D models to predict variable area supersonic gas ejector performances," Energy, Elsevier, vol. 163(C), pages 270-289.
    • Handle: RePEc:eee:energy:v:163:y:2018:i:c:p:270-289
    DOI: 10.1016/j.energy.2018.08.115
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    1. Chunnanond, Kanjanapon & Aphornratana, Satha, 2004. "Ejectors: applications in refrigeration technology," Renewable and Sustainable Energy Reviews, Elsevier, vol. 8(2), pages 129-155, April.
    2. Varga, Szabolcs & Oliveira, Armando C. & Palmero-Marrero, Anna & Vrba, Jakub, 2017. "Preliminary experimental results with a solar driven ejector air conditioner in Portugal," Renewable Energy, Elsevier, vol. 109(C), pages 83-92.
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    Cited by:

    1. Besagni, Giorgio, 2019. "Ejectors on the cutting edge: The past, the present and the perspective," Energy, Elsevier, vol. 170(C), pages 998-1003.
    2. Ll Macia & R. Castilla & P. J. Gamez-Montero & S. Camacho & E. Codina, 2019. "Numerical Simulation of a Supersonic Ejector for Vacuum Generation with Explicit and Implicit Solver in Openfoam," Energies, MDPI, vol. 12(18), pages 1-17, September.

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