基于Kelvin-Helmholtz不稳定性和界面剪切作用的扰动波高预测模型  

Disturbance wave height prediction model based on Kelvin-Helmholtz instability and interfacial shear

作　　者：孙宏军 李腾 李金霞 丁红兵 SUN Hongjun;LI Teng;LI Jinxia;DING Hongbing(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;College Electronic Information and Automation,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072 [2]中国民航大学电子信息与自动化学院,天津300300

出　　处：《化工进展》2024年第2期609-618,共10页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(62373270,61873184,52276159);天津市教委科研计划(2022KJ065)。

摘　　要：环雾状流广泛存在于天然气等工业环境中,深入探究扰动波特性对了解环雾状流的演化规律有着重要意义。本文在内径为15mm的垂直管路中进行了不同工况条件下的环雾状流实验,分别利用电导环传感器和液膜收集系统测量了液膜厚度和夹带率,并通过双阈值方法从液膜时序信号中提取了扰动波高数据。探究了扰动波高和夹带率随气、液相流量和工况压力的变化规律,发现两者均随着液相流量的增大而增大,而随着气相流量和工况压力的增大,扰动波高呈下降趋势,夹带率呈上升趋势,验证了两者之间存在密切关联。然后分析了影响扰动波高的尺度参数,建立了基于Kelvin-Helmholtz不稳定性和界面剪切作用的扰动波高预测模型,相对均方根误差rRMSE为4.05%,且98.7%的数据点都在±10.0%的误差以内,预测效果良好。最后,将新模型与现有的扰动波高关系式进行比较,预测精度和可扩展性都有了较大提高。Annular mist flow widely exists in natural gas and other industrial environments,in-depth exploration of the characteristics of disturbance waves is of significant importance for understanding the evolutionary patterns of annular mist flow.Experiments on gas-liquid two-phase flows were conducted in a vertical pipeline with an inner diameter of 15mm at different operating conditions.The liquid film thickness and droplet entrainment ratio were measured using a conductive ring sensor and a liquid film collection system respectively.The disturbance wave height data were extracted from the temporal signals of conductive ring sensor by using a dual-threshold method.The disturbance wave height and entrainment ratio with changes in gas-liquid flow rates and working pressure were investigated.It was found that both of them increased with increasing liquid flow rate,while they decreased with increasing gas phase flow rate and working pressure,indicating a close correlation between them.Then the scale parameters affecting the disturbance wave height were analyzed,and a disturbance wave height prediction model based on Kelvin-Helmholtz instability and interfacial shear was established.The model exhibited a relative root mean square error(rRMSE)of 4.05%,with 98.7%of data points falling within a±10%error range,demonstrating good fitting performance.Finally,a comparison was made between the proposed model and existing disturbance wave height correlations,both prediction accuracy and scalability have been greatly improved.

关 键 词：气液两相流 液膜 KELVIN-HELMHOLTZ不稳定性 界面剪切作用 扰动波高 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置] TQ021[自动化与计算机技术—控制科学与工程]