朱井育, 杜燕连, 符孟帝等. 气力提升系统气液两相流流动特性研究. 力学与实践, xxxx, x(x): 1-11. doi: 10.6052/1000-0879-23-610
引用本文: 朱井育, 杜燕连, 符孟帝等. 气力提升系统气液两相流流动特性研究. 力学与实践, xxxx, x(x): 1-11. doi: 10.6052/1000-0879-23-610
Zhu Jingyu, Du Yanlian, Fu Mengdi, et al. Study on flow characteristics of gas-liquid two-phase flow in air lift system. Mechanics in Engineering, xxxx, x(x): 1-11. doi: 10.6052/1000-0879-23-610
Citation: Zhu Jingyu, Du Yanlian, Fu Mengdi, et al. Study on flow characteristics of gas-liquid two-phase flow in air lift system. Mechanics in Engineering, xxxx, x(x): 1-11. doi: 10.6052/1000-0879-23-610

气力提升系统气液两相流流动特性研究

STUDY ON FLOW CHARACTERISTICS OF GAS-LIQUID TWO-PHASE FLOW IN AIR LIFT SYSTEM

  • 摘要: 以空气-水作为介质,探究气举泵气液两相流的压力和流量特性,并基于压力信号的时域、功率谱密度函数(power spectral density,PSD)和概率密度函数(probability density function,PDF)分析鉴别流型。结果表明:除了进气喷嘴附近外,其他位置的局部平均压力随气体流速的增大逐渐上升达到峰值后减小,峰值随着浸没比的减小而向右移动且上升速度增大;液体流速随着气体流速增大急剧上升达到峰值后几乎保持不变,最大提升效率约为49%与最大液体流速并不发生在同一个气体流速下;在不同的气流量下,观测到气泡流、帽弹流、弹状流、搅拌流和环状流的出现,不同流型可通过PSD和PDF估计量进行识别;特别是,浸没比越小越有利于形成大气塞。目前,关于气举泵的研究非常有限,本研究结果可为气液固三相流和今后气液两相流的研究提供数据和技术支撑。

     

    Abstract: This study investigates the pressure and flow characteristics of gas-liquid two-phase flow in an air-water medium using an airlift pump. The analysis is based on the time domain, power spectral density (PSD), and probability density function (PDF) of the pressure signal to identify different flow regimes. The results indicate that, except at the vicinity of ejector, the average local pressure at other locations gradually increases with increasing gas velocity, reaching a peak and then decreasing. The peak value shifts towards the right and the rate of increase becomes larger as the submergence ratio decreases. The liquid velocity increases rapidly with increasing gas velocity, reaching a peak and then remaining nearly constant. The maximum enhancement efficiency, which is about 49%, does not occur at the same gas velocity as the maximum liquid velocity. At different gas flow rates, the presence of bubble flow, cap flow, slug flow, churn flow and annular flow was observed. Different flow regimes can be identified through estimation parameters such as PSD and PDF. Especially, the lower the immersion rate, the more favorable it is for the formation of gas slugs (slug flow). The results of this study can provide technical support for the gas-liquid-solid three-phase flow pressure drop and efficiency model and the future study of gas-liquid two-phase flow.

     

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