Effect of ambient pressure oscillation on the primary breakup of cylindrical liquid jet spray

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-07-01 DOI:10.1177/1756827720935553

Zhen Zhang, D. Shin

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引用次数: 4

Abstract

The present simulation study investigates the effects of ambient pressure oscillation on cylindrical liquid jet sprays, using the volume of fluid method. The research is motivated by combustion instability in combustion engines, where strong harmonic pressure oscillation can damage internal structures. Oscillating pressure modulates not only the fuel mass flow rate but also the ambient gas density and liquid surface tension, and in liquid sprays, the ambient fluid density and surface tension can have substantial effects on spray breakup. In order to investigate the multiple property changes with ambient pressure oscillation, therefore, a new solver in OpenFOAM is developed. In the solver, liquid mass flow rate, ambient gas density, and liquid surface tension change simultaneously as a result of pressure oscillation. Simulations were conducted at a Reynolds number of 2000 and Weber number over 2000, conditions that are conducive to primary breakup in laminar flows. The simulations show that oscillations in ambient pressure significantly strengthen the surface instability of the liquid ligament, which depends on the surface tension–pressure coefficient, the mean pressure, and the amplitude of oscillation.

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环境压力振荡对圆柱形液体射流初次破碎的影响

本模拟研究采用流体体积法研究了环境压力振荡对圆柱形液体射流的影响。这项研究的动机是内燃机的燃烧不稳定性，强烈的谐波压力振荡会损坏内部结构。振荡压力不仅调节燃料质量流速，还调节环境气体密度和液体表面张力，并且在液体喷雾中，环境流体密度和表面张力可以对喷雾破裂产生实质性影响。因此，为了研究环境压力振荡时的多重性质变化，开发了一种新的OpenFOAM求解器。在求解器中，液体质量流速、环境气体密度和液体表面张力由于压力振荡而同时变化。模拟是在雷诺数为2000和韦伯数超过2000的条件下进行的，这些条件有利于层流中的初级破裂。模拟表明，环境压力的振荡显著增强了液体韧带的表面不稳定性，这取决于表面张力-压力系数、平均压力和振荡幅度。

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.