Abstract

In this study, a numerical simulation is used to show the physics of a coupled forced perturbation and liquid jet in the presence of a low-velocity coaxial gas flow. The volume of fluid (VOF) approach is employed to capture the liquid–gas interface. A sinusoidal velocity with a finite frequency and amplitude is applied at the liquid jet inlet to define a forced perturbation. An annular gas flow with a velocity lower than that of the liquid jet is imposed to examine its influence on the liquid jet breakup mechanism. The annular gas flow is modulated by the sinusoidal velocity inlet, and the effect of this flow on the liquid jet breakup mechanism is analyzed. Different ratios of the gas velocity to liquid velocity are studied. The results indicate that the low-velocity gas flow can considerably affect the behavior of the liquid jet, and this effect becomes more significant as the amplitude of the forced perturbation increases.

中文翻译：

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同向射流与纵向扰动耦合的行为

摘要

在这项研究中，数值模拟用于显示在存在低速同轴气流的情况下耦合强迫扰动和液体射流的物理现象。流体体积（VOF）方法用于捕获液气界面。在液体射流入口处施加具有有限频率和振幅的正弦速度，以定义强制扰动。施加速度低于液体射流速度的环形气流，以检查其对液体射流破碎机理的影响。环形气流通过正弦速度入口进行调节，并分析了这种气流对液体射流破碎机理的影响。研究了气体速度与液体速度的不同比率。结果表明，低速气流会大大影响液体射流的行为，