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The compound-choking theory as an explanation of the entrainment limitation in supersonic ejectors

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  • Lamberts, Olivier
  • Chatelain, Philippe
  • Bourgeois, Nicolas
  • Bartosiewicz, Yann

Abstract

While the limitation of the entrainment ratio in supersonic ejectors is a well-known phenomenon, there is still a need to gain insight on the choking phenomena at play in on-design operation. In state-of-the-art simplified models of supersonic ejectors, the secondary stream is assumed to reach sonic velocity in a hypothetical throat (Fabri-choking). However, an alternative explanation of the entrainment limitation known as the compound-choking theory states that a nozzle flow with two streams at different stagnation pressures may be choked with a subsonic stream if the other one is supersonic. In this paper, the compound-choking is highlighted in a supersonic ejector through a thorough analysis of numerical simulations validated against experimental data. In addition, comprehensive experimental data of supersonic ejectors are used to assess the performance of the compound-choking theory to predict the entrainment ratio in the on-design regime in various configurations. Most predictions are in the ±10% range when compared to the experimental data. Compared to state-of-the-art 1D models relying on the Fabri-choking assumption, the compound-choking theory is shown to generally perform better regarding the prediction of the on-design entrainment ratio. This study suggests that the compound-choking theory is well suited to model the choking process in supersonic ejectors.

Suggested Citation

  • Lamberts, Olivier & Chatelain, Philippe & Bourgeois, Nicolas & Bartosiewicz, Yann, 2018. "The compound-choking theory as an explanation of the entrainment limitation in supersonic ejectors," Energy, Elsevier, vol. 158(C), pages 524-536.
    • Handle: RePEc:eee:energy:v:158:y:2018:i:c:p:524-536
    DOI: 10.1016/j.energy.2018.06.036
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    References listed on IDEAS

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    2. Croquer, Sergio & Fang, Yu & Metsue, Antoine & Bartosiewicz, Yann & Poncet, Sébastien, 2021. "Compound-choking theory for supersonic ejectors working with real gas," Energy, Elsevier, vol. 227(C).
    3. Wang, Kai & Wang, Lei & Gao, Rui, 2023. "An extended mechanism model of gaseous ejectors," Energy, Elsevier, vol. 264(C).
    4. Metsue, Antoine & Debroeyer, Romain & Poncet, Sébastien & Bartosiewicz, Yann, 2022. "An improved thermodynamic model for supersonic real-gas ejectors using the compound-choking theory," Energy, Elsevier, vol. 238(PB).
    5. Besagni, Giorgio, 2019. "Ejectors on the cutting edge: The past, the present and the perspective," Energy, Elsevier, vol. 170(C), pages 998-1003.
    6. Van den Berghe, Jan & Dias, Bruno R.B. & Bartosiewicz, Yann & Mendez, Miguel A., 2023. "A 1D model for the unsteady gas dynamics of ejectors," Energy, Elsevier, vol. 267(C).
    7. 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.
    8. Zhou, Yifan & Chen, Guangming & Hao, Xinyue & Gao, Neng & Volovyk, Oleksii, 2023. "Working mechanism and characteristics analysis of a novel configuration of a supersonic ejector," Energy, Elsevier, vol. 278(PB).

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