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

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  • Duan, Dingli
  • Liu, Feng
  • Wang, Meng

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.

Suggested Citation

  • Duan, Dingli & Liu, Feng & Wang, Meng, 2025. "Experimental investigation and mechanism analysis on the performance of a novel tab-nozzle ejector," Energy, Elsevier, vol. 336(C).
    • Handle: RePEc:eee:energy:v:336:y:2025:i:c:s0360544225042380
    DOI: 10.1016/j.energy.2025.138596
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