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Simulation study of key cross-sectional area dimensions of CO2 ejector on performance.

Author(s) : ZENG H., ZHAO H., ZHANG H., LIU Z.

Type of article: IJR article

Summary

In this paper, based on the homogeneous equilibrium model, the effects of nozzle inlet cross-sectional area, nozzle throat cross-sectional area, pre-mixing chamber cross-sectional area, mixing chamber cross-sectional area, and diffusion chamber outlet cross-sectional area on the performance of the ejector of a CO2 transcritical refrigeration system are analyzed by using Ansys Fluent. The simulation results show that the primary flow rate of the ejector is sensitive only to the nozzle throat cross-sectional area, while the entrainment ratio is strongly influenced by the nozzle throat and the mixing chamber cross-sectional area, and there is an optimum value. The nozzle inlet cross-sectional area has no significant effect on the performance of the ejector. The pre-mixing and diffusion chamber outlet cross-sectional areas do not have a significant effect on the performance within a limited range, but deviating too much from the optimum value can also lead to degradation of ejector performance.

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Pages: 276-286

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Details

  • Original title: Simulation study of key cross-sectional area dimensions of CO2 ejector on performance.
  • Record ID : 30032229
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 159
  • Publication date: 2024/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2023.12.019

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