A study on the performance of a swirling–straight composite nozzle

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-01-15 DOI:10.1002/apj.3025

Dongxing Yu, Shuchao Li, Jun Zhang, Ning Wang, Zongyu Ling

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Abstract

The nozzle is the key component of water mist fire extinguishing system. As a response to the problems of small injection angle associated with straight jet nozzles and the weak axial momentum of swirl nozzles, a swirling–straight composite nozzle is designed in this work. The comparison with a straight jet nozzle and a pressure swirl nozzle shows that the swirling–straight composite nozzle has a larger axial momentum and better injection angle. Under the same pressure, the volume flow of the swirling–straight composite nozzle is more than 27% of the pressure swirl nozzle, and the injection angle was more than 65% of straight jet nozzle. The numerical model of the swirling–straight composite nozzle is established. Meantime, the internal flow field characteristics and the influence of the straight jet aperture on the performance are studied. The results demonstrate that the straight jet fluid and swirling fluid can be mixed well in the nozzle, and a larger axial momentum and tangential momentum can be obtained. With the increase of the straight jet aperture, the swirl effect in the nozzle becomes weaker, the injection angle becomes smaller, and the axial momentum improves. When the straight jet aperture increases from 1.1 to 1.9 mm, the straight jet volume flow at the nozzle inlet increases by 127%, and the injection angle reduces by 40%.

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漩涡-直线复合喷嘴性能研究

喷嘴是水雾灭火系统的关键部件。针对直射式喷嘴喷射角小、漩涡式喷嘴轴向动量小的问题，本文设计了一种漩涡-直射复合喷嘴。与直射流喷嘴和压力漩涡喷嘴相比，漩涡-直流复合喷嘴具有更大的轴向动量和更好的喷射角。在相同压力下，漩涡-直复合喷嘴的体积流量是压力漩涡喷嘴的 27% 以上，喷射角是直射流喷嘴的 65% 以上。建立了漩涡-直流复合喷嘴的数值模型。同时，研究了内部流场特征和直射孔径对性能的影响。结果表明，直射流体和漩涡流体能在喷嘴中很好地混合，并能获得较大的轴向动量和切向动量。随着直射孔径的增大，喷嘴中的漩涡效应变弱，喷射角变小，轴向动量得到改善。当直射流孔径从 1.1 毫米增加到 1.9 毫米时，喷嘴入口处的直射流体积流量增加了 127%，喷射角减小了 40%。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.