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渐缩后缘开缝喷嘴引射器性能分析
Analysis of Notched Ejector Performance

DOI: 10.12677/ME.2022.101009, PP. 64-76

Keywords: 引射器，后缘开缝喷嘴，引射效率，流向涡
Ejector, Notched Ejector, Entrainment Efficiency, Steam-Wise Vortex

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Abstract:

建立了三维引射器物理模型，结合计算软件，对后缘开缝渐缩喷嘴对引射器效率的影响进行了研究。通过控制变量法，将开缝喷嘴引射器性能与普通喷嘴引射器进行了对比，分别分析了开缝的缝数、缝长、缝宽对引射器的引射效率的影响，发现适当的缝参数会使喷嘴出口形成流向涡，流向涡有助于卷吸引射流体，提高引射器的引射效率，流向涡强度越大，持续距离越长，则引射效率越高；缝数、缝长、缝宽皆存在最佳值，使引射器性能达到最佳；相比于普通喷嘴，在本文所研究的参数范围内，引射比最多提高了40.8%，引射流体压力喷嘴出口压力之差最多下降了25.3%。
The three-dimensional model of the ejector was established. The influence of the notched nozzle on the ejector efficiency was analyzed by using the calculation software. Compared with the ordinary ejector, the effect of the number, length and width of the slit on the notched ejector performance was respectively analyzed by variable control. The results showed that suitable slit caused steam-wise vortex around the nozzle exit. The steam-wise vortex can contribute to the suction of ejection fluid and thus improve the entrainment efficiency. The vortex with larger strength and a longer distance span results in higher efficiency. There are optimum values for the number of seams, the length of the seams and the width of the seams, which make the performance of the ejector reach the best. In the parameter range studied in this paper, compared with ordinary nozzles, the entrainment ratio increased by 40.8% at most, and the outlet pressure difference between the ejection fluid and nozzle outlet pressure decreased by 25.3% at most.

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