基于改进互相关法的气固两相栓塞流速测量

doi:10.3969/j.issn.0438-1157.2014.10.011

化工学报 ›› 2014, Vol. 65 ›› Issue (10): 3820-3828.DOI: 10.3969/j.issn.0438-1157.2014.10.011

基于改进互相关法的气固两相栓塞流速测量

薛倩^1,2, 王化祥², 马敏¹, 崔自强²

1 中国民航大学航空自动化学院, 天津 300300;
2 天津大学电气与自动化工程学院, 天津 300072

收稿日期:2014-02-18 修回日期:2014-05-31 出版日期:2014-10-05 发布日期:2014-10-05
通讯作者: 马敏
基金资助:
国家自然科学基金项目（61401466，61301244，61102096，61201350）；中央高校基本科研业务费中国民航大学专项（3122013C007）；中国民航大学科研启动基金项目（2013QD01S）。

Measurement of gas/solid two-phase plug flow velocity based on modified cross-correlation method

XUE Qian^1,2, WANG Huaxiang², MA Min¹, CUI Ziqiang²

1 School of Aeronautical Automation, Civil Aviation University of China, Tianjin 300300, China;
2 School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China

Received:2014-02-18 Revised:2014-05-31 Online:2014-10-05 Published:2014-10-05
Supported by:
supported by theNational Natural Science Foundation of China (61401466, 61301244, 61102096, 61201350), the Fundamental Research Funds for the Central Universities (3122013C007) and the Scientific Research Starting Foundation of Civil Aviation University of China (2013QD01S).

摘要/Abstract

摘要： 在双截面电容层析成像（ECT）系统测量气力输送过程中栓塞流速度的应用中，利用动力学相关因子指数检测电容信号的均值突变，根据突变点设置时间窗以提取上下游信号，将所选信号映射成二值图像，并进行数学形态学闭运算处理，对处理后的图像进行二维互相关计算，估算出栓塞流速度。实验结果表明了该方法的有效性，和传统互相关法相比，改进互相关法可有效提取有明显波动特征的信号段，并通过二维图像互相关计算提高了互相关法的稳定性，从而提高了ECT技术在线测量两相流的准确性。

关键词: 成像, 两相流, 气力输送, 颗粒物料, 测量

Abstract: In the application of twin-plane electrical capacitance tomography (ECT) system to velocity measurement of plug flow in pneumatic conveying process, the dynamic lag correlation exponent was used to detect the average value abrupt changes of capacitance, and the detected abrupt change-points were used to determine the time windows for selecting proper upstream and downstream signals. The selected signals were thereafter mapped into binary images, which were then processed with mathematical morphology closed operation. Finally, the velocity of plug flow was estimated by implementing two dimensional cross correlation between the processed images. Experimental results demonstrated the effectiveness of the proposed method. Compared to the traditional cross-correlation method, the modified method could extract signals containing obvious fluctuations effectively, and improve the robustness of the cross correlation method by using two dimensional image correlation, enhancing the reliability of online measurement of two-phase flow using ECT.

Key words: tomography, two-phase flow, pneumatic conveying, granular materials, measurement

中图分类号:

TK39

薛倩, 王化祥, 马敏, 崔自强. 基于改进互相关法的气固两相栓塞流速测量[J]. 化工学报, 2014, 65(10): 3820-3828.

XUE Qian, WANG Huaxiang, MA Min, CUI Ziqiang. Measurement of gas/solid two-phase plug flow velocity based on modified cross-correlation method[J]. CIESC Journal, 2014, 65(10): 3820-3828.

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基于改进互相关法的气固两相栓塞流速测量

Measurement of gas/solid two-phase plug flow velocity based on modified cross-correlation method

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