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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

CFD simulation study on the performance of two-stage ejector in ejector refrigeration system

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喷射制冷系统中两级喷射器性能的 CFD 模拟研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), May.2025, Vol.48 No.5: 591-597

DOI: 10.3969/j.issn.1003-5060.2025.05.003

Authors

SU Jianxiu, LI Fenglei

(College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

Abstract and Keywords

Abstract: The two-stage ejector (TSE), as a device with the enhanced performance by taking full advantage of the dissipated momentum in the mixing chamber, has significantly improved the entrainment ratio compared to the traditional single-stage ejector (SSE). However, limited research has been focused on the TSE in refrigeration system. Herein, a new TSE used in the refrigeration system was studied, as well as its performance according to computational fluid dynamics (CFD). Meanwhile, the $ k-\omega $ SST turbulence model and R134a refrigerant were adopted, the performance of TSE under different working pressure, injection pressure and condensing pressure was simulated and compared with that of the SSE under the same working condition. The results show that compared with the SSE, the entrainment ratio of the TSE increases up to 57.50%, whereas the critical condensing pressure may reduce by 18.98% or less.

Keywords: two-stage ejector (TSE); single-stage ejector (SSE); computational fluid dynamics (CFD); entrainment ratio; critical back pressure

作者信息

苏建秀，李风雷

(太原理工大学土木工程学院，山西太原 030024)

摘要和关键词

摘要: 两级喷射器是一种可以利用混合室内耗散的动量来提升其性能的装置,相较于传统的单级喷射器其喷射系数显著提高,但目前对两级喷射器在制冷系统中的研究有限。文章提出一种新的可用于制冷系统中的两级喷射器,并采用计算流体动力学(computational fluid dynamics, CFD)对两级喷射器的性能进行研究。采用 $ k-\omega $ SST湍流模型、R134a制冷剂对不同工作压力、引射压力、冷凝压力下的两级喷射器进行模拟,并与同工况条件下单级喷射器的性能进行对比。研究结果表明,与单级喷射器相比,两级喷射器的喷射系数最高可提高57.50%,而临界冷凝压力有所下降,最大可降低18.98%。

关键词: 两级喷射器；单级喷射器；计算流体动力学(CFD)；喷射系数；临界背压

Funding

国家自然科学基金资助项目(51906172); 山西省重点研发计划资助项目(202102060301014) 和山西省基础研究计划资助项目(202103021224098)

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