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Effects of Mixer Length and Diffuser Angle on Two-Phase CO2 Ejector
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Junan Long1, Meina Pan2, Junye Shi1, 3, Jiangping Chen1, 3
Journal of Refrigeration | 2025, 46(1) : 132 - 139
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Journal of Refrigeration | 2025, 46(1): 132-139
Effects of Mixer Length and Diffuser Angle on Two-Phase CO2 Ejector
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Junan Long1, Meina Pan2, Junye Shi1, 3, Jiangping Chen1, 3
Affiliations
  • 1.Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai, 200240, China
  • 2.Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
  • 3.Shanghai High Efficient Cooling System Research Center, Shanghai, 200240, China
Published: 2025-02-16 doi: 10.12465/j.issn.0253-4339.2025.01.132
Outline
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This study employed a validated computational fluid dynamics (CFD) model to investigate the influences of the mixer length and diffuser angle on the ejector pressure-recovery performance. The results demonstrated that an optimal combination of mixer length and diffuser angle exists at which the ejector has the highest performance. The effects of these two geometrical parameters on the ejector performance were highly consistent. When the mixer length was sufficiently long, the mixing was sufficient, and the mixed flow was not subjected to separation during pressure recovery. Under these circumstances, the effect of the diffuser angle on the ejector performance was relatively trivial, varying between 0.5° and 3°. However, when the mixer length was short, the flow was prone to turbulent losses near the diffuser wall. In this case, the effect of the diffuser angle was significant. In addition, the optimal geometries were affected by the operating conditions. The optimal mixer length increased as the nozzle inlet pressure and temperature decreased, whereas the optimal diffuser angle decreased. Under the conditions and nozzle configuration investigated in this study, the optimal mixer length was approximately 38 mm and the optimal diffuser cone half angle was between 1° and 1.5°.

Junan Long, Meina Pan, Junye Shi, Jiangping Chen. Effects of Mixer Length and Diffuser Angle on Two-Phase CO2 Ejector[J]. Journal of Refrigeration, 2025 , 46 (1) : 132 -139 . DOI: 10.12465/j.issn.0253-4339.2025.01.132
Funding
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  • National Natural Science Foundation of China(51776119)
Appendix
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Year 2025 volume 46 Issue 1
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110
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Article Info
doi: 10.12465/j.issn.0253-4339.2025.01.132
  • Receive Date：2023-11-22
  • Online Date：2026-03-13
  • Published：2025-02-16
Article Data
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History
  • Received：2023-11-22
  • Revised：2023-12-10
  • Accepted：2024-01-24
Funding
National Natural Science Foundation of China(51776119)
Affiliations
    1.Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai, 200240, China
    2.Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
    3.Shanghai High Efficient Cooling System Research Center, Shanghai, 200240, China

Corresponding:

Chen Jiangping, male, Ph. D., professor, Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, 86-21-34206775, E-mail: . Research fields: refrigeration and cryogenics, automotive air conditioning technology.
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Citations
表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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