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在对传统方法测量和分析液膜特性的基础上,采用激光诱导荧光方法和互相关测量技术,对竖直管道中的液膜流速进行光学测量和分析。基于高速摄影获取气液环状流中液膜图像,采用数字图像处理技术对液膜流动图像进行处理,得到液膜厚度在空间上的分布函数变化曲线,对间隔固定帧频的液膜图像进行互相关处理,进而采用抛物线拟合,有效提高了互相关极值的测量精度。实验结果表明,本文方法非接触、适用面广,可以有效检测环状流中液膜“破断”现象,并准确测量液膜流速参数。
Based on the measurement and analysis of the liquid film characteristics of the traditional method, the laser induced fluorescence method and the cross-correlation measurement technique were used to measure and analyze the optical velocity of the liquid film in the vertical pipe. The liquid film images in the gas-liquid annular flow are obtained based on high-speed photography. The digital image processing technology is used to process the liquid film flow images to obtain the distribution curve of the liquid film thickness in space. Cross-correlation processing, and then use the parabolic fitting, effectively improve the accuracy of cross-correlation extremum. Experimental results show that this method is non-contact and suitable for a wide range of applications. It can effectively detect the phenomenon of liquid film “broken” in annular flow and measure the parameters of liquid membrane velocity accurately.