Influence of geometric parameters on the performance of ejector used in aeroengine air system

Zhang, Jingyang; Geng, Jin-xin; Yang, Sen; Cheng, Fengna; Zhu, Guiping; Yang, Zhen-xi; Lyu, Yuan-wei

doi:10.1016/j.tsep.2022.101571

Cited by 4 publications

(1 citation statement)

References 28 publications

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“…The geometric parameters, particularly the suction part height, mixing and diffuser section diameters, might affect the ejector's performance. Research by Zhang J. et al in 2023 [44] has shown that ejector performance may be greatly enhanced by expanding the mixing part diameter. The effect of the nozzle's four geometric parameters-throat diameter, divergent angle, convergent angle, and length-on the entrainment performance was examined in research carried out by Feng et al in 2020 [45].…”

Section: Introductionmentioning

confidence: 99%

An Experimental Comparative Performance Study of Variable Area Ejectors in Different Operating Conditions

Kumar,

Subbarao

2024

Preprint

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This research experimentally compares the performance of two variable area ejectors designed based on the Constant Rate of Momentum Change (CRMC) approach and the Constant Rate of Kinetic Energy Change (CRKEC) approach. Ejector systems were designed for specific design and operating conditions to perform experiments. The pressure recovery ratio (PRR) and entrainment ratio (ω) at on-design operating conditions were compared using the experimental results. The study also optimized the entrainment ratio of both systems at off-design conditions. The results indicate that both variable-area ejectors based on CRMC and CRKEC have their own advantages and limitations in terms of performance and suitability for specific applications. CRMC ejectors provide higher entrainment ratios (0.512) and lower pressure recovery ratios (0.178), while CRKEC ejectors provide slightly higher pressure recovery ratios (0.18) and lower entrainment ratios (0.5) at on-design conditions. Furthermore, the study investigated the off-design impact of nozzle exit positions (NXPs) and the pressure of motive and secondary flows on the entrainment ratio of both ejectors.

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Section: Introductionmentioning

confidence: 99%

An Experimental Comparative Performance Study of Variable Area Ejectors in Different Operating Conditions

Kumar,

Subbarao

2024

Preprint

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Comparative study on two low-grade heat driven ejection-compression refrigeration cycles with evaporator-condenser and evaporator-subcooler

Li,

Liu,

et al. 2023

Thermal Science and Engineering Progress

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Experimental Investigation of the Performance of a Novel Ejector–Diffuser System with Different Supersonic Nozzle Arrays

Xu,

Gu,

et al. 2024

Fluids

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The supersonic–supersonic ejector–diffuser system is employed to suck supersonic low-pressure and low-temperature flow into a high-pressure environment. A new design of a supersonic–supersonic ejector–diffuser was introduced to verify pressure control performance under different operating conditions and vacuum background pressure. A 1D analysis was used to predict the geometrical structure of an ejector–diffuser with a rectangular section based on the given operating conditions. Different numbers and types of nozzle plates were designed and installed on the ejector to study the realizability of avoiding or postponing the aerodynamic choking phenomenon in the mixing section. The effects of different geometrical parameters on the operating performance of the ejector–diffuser system were discussed in detail. Experimental investigation of the effects of different types of nozzle plates and the back pressures on the pressure control performance of the designed ejector–diffuser system were performed in a straight-flow wind tunnel. The results showed that the position, type and number of the nozzle plates have a significant impact on the beginning of the formation of aerodynamic choking. The geometry of the ejector and the operating conditions, especially the backpressure and inlet pressure of the ejecting stream, determined the entrainment ratio of the two supersonic streams. The experimental results showed that long nozzle-plate had a better performance in terms of maintaining pressure stability in the test section, while short a nozzle-plate had a better pressure matching performance and could maintain a higher entrainment ratio under high backpressure conditions.

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Influence of geometric parameters on the performance of ejector used in aeroengine air system

Cited by 4 publications

References 28 publications

An Experimental Comparative Performance Study of Variable Area Ejectors in Different Operating Conditions

An Experimental Comparative Performance Study of Variable Area Ejectors in Different Operating Conditions

Comparative study on two low-grade heat driven ejection-compression refrigeration cycles with evaporator-condenser and evaporator-subcooler

Experimental Investigation of the Performance of a Novel Ejector–Diffuser System with Different Supersonic Nozzle Arrays

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