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Realization of novel constant rate of kinetic energy change (CRKEC) supersonic ejector

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  • Kumar, Virendra
  • Singhal, Gaurav
  • Subbarao, P.M.V.

Abstract

Ejectors invariably convert momentum and kinetic energy of incoming fluids into enthalpy and hence pressure. Since ejectors are primarily viewed as energy exchange devices, it would be appropriate to design an ejector with its geometry being a function of the rate of energy change. This would shift ejector design approach from conventional geometry based one to that of flow physics-based approach. Hence, the paper presents a unique approach to evolving ejector design considering it primarily to be a function energy change within the system, specifically being constant rate of kinetic energy change (CRKEC). This approach has benefits in terms of mitigating the occurrence of thermodynamic shock, which is a major irreversibility that besets conventional ejector systems. A 1-D gas dynamic model including frictional effects for a more realistic design has been developed for estimating supersonic ejector geometry based on CRKEC approach. The model has been used to predict the geometry of a supersonic air ejector for typical input parameters viz., entrainment ratio (ω) ∼0.53, recovery ratio(ζ) ∼1.4, primary stagnation pressure(Pop) ∼5.7 bar, secondary stagnation pressure(Pos) ∼0.7 bar. The results have been verified through detailed numerical analysis using Navier-Stokes system of equations with turbulence in a 2-D axi-symmetric formulation. Also, the experimental results on the developed prototype, which have also been discussed, are observed to be in close agreement with predictions of 1-D gas dynamic model and the numerical studies.

Suggested Citation

  • Kumar, Virendra & Singhal, Gaurav & Subbarao, P.M.V., 2018. "Realization of novel constant rate of kinetic energy change (CRKEC) supersonic ejector," Energy, Elsevier, vol. 164(C), pages 694-706.
    • Handle: RePEc:eee:energy:v:164:y:2018:i:c:p:694-706
    DOI: 10.1016/j.energy.2018.08.184
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    References listed on IDEAS

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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. Besagni, Giorgio & Mereu, Riccardo & Inzoli, Fabio, 2016. "Ejector refrigeration: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 53(C), pages 373-407.
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    Cited by:

    1. Ilya A. Lysak & Galina V. Lysak & Vladimir Yu. Konyukhov & Alena A. Stupina & Valeriy E. Gozbenko & Andrei S. Yamshchikov, 2023. "Efficiency Optimization of an Annular-Nozzle Air Ejector under the Influence of Structural and Operating Parameters," Mathematics, MDPI, vol. 11(14), pages 1-18, July.
    2. Bourhan Tashtoush & Iscah Songa & Tatiana Morosuk, 2022. "Exergoeconomic Analysis of a Variable Area Solar Ejector Refrigeration System under Hot Climatic Conditions," Energies, MDPI, vol. 15(24), pages 1-19, December.
    3. Besagni, Giorgio, 2019. "Ejectors on the cutting edge: The past, the present and the perspective," Energy, Elsevier, vol. 170(C), pages 998-1003.

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