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IIR document

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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Indexing

Themes: CO2;
Ejector systems, air cycle, Stirling cycle, other cycles)
Keywords: Simulation; CO2; R744; CFD; Transcritical cycle; Nozzle; Ejector system; Modelling