Temporal and spatial evolution characteristics of gas-liquid two-phase flow pattern based on image texture spectrum descriptor  

作　　者：周曦国 金宁德 王振亚 张问银 

机构地区：[1]School of Electrical Engineering and Automation,Tianjin University [2]College of Computer and Information Engineering,Tianjin Normal University

出　　处：《Optoelectronics Letters》2009年第6期445-449,共5页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.50674070);National High Technology Research and Development Program of China (No.2007AA06Z231)

摘　　要：The dynamic image information of typical gas-liquid two-phase flow patterns in vertical upward pipe is captured by a high-speed dynamic camera.The texture spectrum descriptor is used to describe the texture characteristics of the processed images whose content is represented in the form of texture spectrum histogram,and four time-varying characteristic parameter indexes which represent image texture structure of different flow patterns are extracted.The study results show that the amplitude fluctuation of texture characteristic parameter indexes of bubble flow is lowest and shows very random complex dynamic behavior;the amplitude fluctuation of slug flow is higher and shows intermittent motion behavior between gas slug and liquid slug,and the amplitude fluctuation of churn flow is the highest and shows better periodicity;the amplitude fluctuation of bubble-slug flow is from low to high and oscillating frequence is higher than that of slug flow,and includes the features of both slug flow and bubble flow;the slugchurn flow loses the periodicity of slug flow and churn flow,and the amplitude fluctuation is high.The results indicate that the image texture characteristic parameter indexes of different flow pattern can reflect the flow characteristics of gas-liquid two-phase flow,which provides a new approach to understand the temporal and spatial evolution of flow pattern dynamics.The dynamic image information of typical gas-liquid two-phase flow patterns in vertical upward pipe is captured by a high-speed dynamic camera.The texture spectrum descriptor is used to describe the texture characteristics of the processed images whose content is represented in the form of texture spectrum histogram,and four time-varying characteristic parameter indexes which represent image texture structure of different flow patterns are extracted.The study results show that the amplitude fluctuation of texture characteristic parameter indexes of bubble flow is lowest and shows very random complex dynamic behavior;the amplitude fluctuation of slug flow is higher and shows intermittent motion behavior between gas slug and liquid slug,and the amplitude fluctuation of churn flow is the highest and shows better periodicity;the amplitude fluctuation of bubble-slug flow is from low to high and oscillating frequence is higher than that of slug flow,and includes the features of both slug flow and bubble flow;the slugchurn flow loses the periodicity of slug flow and churn flow,and the amplitude fluctuation is high.The results indicate that the image texture characteristic parameter indexes of different flow pattern can reflect the flow characteristics of gas-liquid two-phase flow,which provides a new approach to understand the temporal and spatial evolution of flow pattern dynamics.

关 键 词：气液两相流 流动模式 纹理谱 空间演化特征 基于图像 图像纹理特征 波动幅度 时间 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]