A novel 1-D single-mixed-flow homogeneous equilibrium model of two-phase ejector using CO2 as refrigerant

Cong You, Benoit Michel and Rémi Revellin

Energy, 2025, vol. 322, issue C

Abstract: This paper introduces a novel 1-D single-mixed-flow homogeneous equilibrium model (HEM) based on finite volume method (FVM), applicable to the entire ejector domain. The proposed 1-D HEM was validated against independent experimental data from the open literature, demonstrating that the relative deviations in ejector outlet pressure and motive flow mass flow rate fall within 10 % and 15 %, respectively. Additionally, the comparison results indicate that the novel 1-D HEM exhibits greater efficiency and stability without compromising accuracy compared to existing more complicated 1-D HEM models. The developed 1-D model demonstrates significant value in the design process, facilitating a comprehensive parametric analysis of ejector geometry. Four key parameters – the diameter of the constant-area mixing section, the length and angle of the ejector’s diffuser, and the wall roughness – were investigated to assess their impact on ejector performance. The results indicate that the diameter of the constant-area mixing section has the most pronounced influence on ejector performance, with a smaller diameter enhancing pressure recovery and efficiency. Additionally, the modeling analysis suggests that a larger diffuser angle improves ejector performance. In contrast, the diffuser length and wall roughness exhibit relatively minor effects compared to the other parameters. The simulation results can serve as a valuable guide for ejector design and parametric analysis.

Keywords: Transcritical CO2 ejector; 1-D modeling; Two-phase flow; Geometric design; Finite volume method (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:322:y:2025:i:c:s0360544225010096

DOI: 10.1016/j.energy.2025.135367

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