Two-fluid coaxial atomization in a high-pressure environment
Two-fluid coaxial atomization in a high-pressure environment
复制标题
高压环境下的二流体同轴雾化
DOI：
10.1017/jfm.2022.586
复制
发表时间：
2022
影响因子：
3.7
通讯作者：
A. Aliseda
中科院分区：
文献类型：
--
作者：
Kee Onn Fong;Xinzhi Xue;R. Osuna;A. Aliseda
摘要本文研究了在不同气压下同轴气流作用下液柱的雾化动力学。具体而言，我们分析了如何与周围和共流气体射流中的气体压力升高相关的气体密度增加影响液体不稳定和破碎过程，以及由此产生的液滴形成和分散。我们提出了新的实验结果的同轴液-气雾化器在高压环境中工作，气液动量比在范围$M = 5\unicode{x2013}56$和加压气体密度$\rho _g/\rho _0 = 1\unicode{x2013}5$，其中$\rho _0$是在标准条件下的环境气体密度。高速阴影图像被用来量化的空间和时间变化的液-气界面在喷雾近场。液芯长度，扩展角和其他喷雾指标，并确定气体密度的影响，在大气条件下的雾化比较。在喷雾中场，相位多普勒干涉与激光多普勒测速一起使用，以量化液滴的尺寸和速度，以及它们在喷雾中的径向变化。结果表明，在升高的环境压力下的液滴尺寸的增加，当保持气液动量比恒定。最后，我们表明，这些意见是符合从开尔文-亥姆霍兹和瑞利-泰勒不稳定性，这两者都是有关的气液雾化过程的预测。
Abstract We study the dynamics of atomization of a liquid column by a coaxial gas flow with varying gas pressures. Specifically, we analyse how the gas density increase associated with elevated gas pressures in the ambient and co-flowing gas jet influences the liquid destabilization and breakup process, as well as the resulting droplet formation and dispersion. We present new experimental results for a coaxial liquid–gas atomizer operating in a high-pressure environment, with gas–liquid momentum ratio in the range $M = 5\unicode{x2013}56$ and pressurized gas densities $\rho _g/\rho _0 = 1\unicode{x2013}5$, where $\rho _0$ is the ambient gas density at standard conditions. High-speed shadowgraphy images are used to quantify the spatially and temporally varying liquid–gas interface in the spray near-field. Liquid core lengths, spreading angles and other spray metrics are presented, and the influence of gas density is identified from the comparison with atomization at atmospheric conditions. In the spray mid-field, phase Doppler interferometry is used in conjunction with laser Doppler velocimetry to quantify the droplet size and velocities, as well as their radial variations across the spray. Results show an increase in droplet size at elevated ambient pressures, when keeping the gas–liquid momentum ratio constant. Finally, we show that these observations are in line with predictions from the Kelvin–Helmholtz and Rayleigh–Taylor instabilities, both of which are relevant to the gas–liquid atomization process.
入口气体湍流对两相混合层界面波形成、发展和破碎的影响
影响因子：
3.7
作者：
Jiang, D.;Ling, Y.
通讯作者：
Ling, Y.