Experimental investigation and mechanism analysis on the performance of a novel tab-nozzle ejector

Dingli Duan, Feng Liu and Meng Wang

Energy, 2025, vol. 336, issue C

Abstract: The ejector is a type of fluid machine that can utilise waste heat and low-grade energy without consuming electrical energy, making it a powerful tool for sustainable development. Improving entrainment performance has been an important topic and research direction since the invention of the ejector. This study proposes a novel tab-nozzle ejector. The entrainment and compression performance were experimentally studied under different geometries and operating conditions. In addition, the supersonic confined jet oblique shock-wave structure and the supersonic confined jet mixing layer were visualised using a particle image velocimetry (PIV) system to analyse the performance enhancement mechanism of the proposed novel tab-nozzle ejector. The results show that the entrainment performance of the novel tab-nozzle ejector can be improved by 18.8 % under critical mode, while under subcritical mode it can be improved by more than 30 %, with a maximum entrainment ratio improvement rate of 75.4 % compared to conventional ejectors. Importantly, the experimental results demonstrate that the novel tab-nozzle ejector enhances entrainment performance while maintaining the compression ratio. This study provides useful guidance for exploring performance enhancement in ejectors.

Keywords: Tab-nozzle ejector; Compression ratio; Entrainment performance; Mechanism analysis (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:336:y:2025:i:c:s0360544225042380

DOI: 10.1016/j.energy.2025.138596

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