Experimental studies on primary breakup of liquid jets injected intolow-speed air crossflow

doi:10.16085/j.issn.1000-6613.2019-1143

Abstract

Abstract:

The experimental setup of jet breakup and atomization was established. It was visualized to study the effects of different gas-liquid dimensionless parameters on the characteristics of the breakup modes and the jet penetration trajectory under the action of low-speed air crossflow. Experimental results showed that, two breakup modes of liquid jets injected into low-speed air crossflow were attained, including column breakup and bag breakup, among which column breakup can be divided into bump breakup and arcade breakup. According to the experimental regimes map based on the q and We_j of breakup processes, the q and the We_j together determined the jet breakup mode under low-speed air crossflow conditions. The transition boundary curve between different breakup modes were found. In addition, the logarithmic formula of jet penetration trajectory curve based on dimensionless parameters such as liquid-gas momentum flux ratio q, liquid We_j, liquid Re_j, can well predict the liquid jet penetration trajectory under the action of low-speed air crossflow, and the flux-momentum ratio q is the main dimensionless parameter that affects jet penetration trajectory.

Key words: gas-liquid flow, liquid injection, primary breakup, mixing, breakup modes, jet penetration trajectory

摘要：

基于专门搭建的射流破碎雾化实验平台，利用高速摄像可视化研究低速横流作用下不同气液量纲为1参数对液体射流初次破碎模式特征和射流穿透轨迹特征的影响规律。实验结果表明，低速横流作用下液体射流破碎存在柱状破碎和袋式破碎两种模式，其中柱状破碎又可以分为鼓包破碎和拱形破碎。从实验得到的液气动量通量比q和液体韦伯数We_j射流破碎模式图可以看出，液气动量通量比q和液体韦伯数We_j共同决定低速横流条件下射流破碎模式，不同破碎模式之间存在明显的过渡边界。结合液气动量通量比q、液体韦伯数We_j、液体雷诺数Re_j等量纲为1参数，拟合得到了射流穿透轨迹曲线对数形式公式，该公式能够很好地预测低速横流作用下液体射流穿透轨迹，其中液气动量通量比q是影响射流穿透轨迹的主要量纲为1参数。

关键词: 气液两相流, 液体射流, 初次破碎, 混合, 破碎模式, 射流穿透轨迹

CLC Number:

TQ027.3

Tian LAN,Lingzhen KONG,Jiaqing CHEN,Kuisheng WANG. Experimental studies on primary breakup of liquid jets injected intolow-speed air crossflow[J]. Chemical Industry and Engineering Progress, 2020, 39(4): 1282-1291.

兰天,孔令真,陈家庆,王奎升. 低速横流作用下液体射流初次破碎实验[J]. 化工进展, 2020, 39(4): 1282-1291.

Figures/Tables 7

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