Tang Xiao-Yu, Huang Junchao, Ji Haifeng, Wang Baoliang, Huang Zhiyao
State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
Rev Sci Instrum. 2020 May 1;91(5):055001. doi: 10.1063/1.5134548.
Based on the CD technique and cross correlation velocity measurement technique, a new method for bubble/slug velocity measurement of the gas-liquid two-phase flow in small channels is proposed. A new CD sensor, which is suitable for the parameter measurement of the gas-liquid two-phase flow in small channels, is developed by introducing the principle of capacitive reactance elimination. With two new CD sensors, a bubble/slug velocity measurement system is developed, and the bubble/slug velocity is determined by the cross correlation velocity measurement technique. To verify the effectiveness of the proposed bubble/slug velocity measurement method, three prototypes of bubble/slug velocity measurement systems with different diameters (1.82 mm, 2.65 mm, and 2.96 mm, respectively) were established, and the bubble/slug measurement experiments were carried out. The research results show that the capacitive reactance elimination is an effective way to overcome the unfavorable influence of the coupled capacitances on measurement results. The experimental results indicate that the proposed method can successfully realize the bubble/slug velocity measurement in small channels, and the velocity measurement accuracy is satisfactory. For the three prototypes of the bubble/slug velocity measurement system, the maximum relative errors of the bubble/slug velocity measurement are all less than 5%.
基于电容式差压（CD）技术和互相关速度测量技术，提出了一种测量小通道气液两相流中气泡/弹状流速度的新方法。通过引入容抗消除原理，研制了一种适用于小通道气液两相流参数测量的新型CD传感器。利用两个新型CD传感器，开发了一种气泡/弹状流速度测量系统，并通过互相关速度测量技术确定气泡/弹状流速度。为验证所提出的气泡/弹状流速度测量方法的有效性，建立了三种不同直径（分别为1.82mm、2.65mm和2.96mm）的气泡/弹状流速度测量系统样机，并进行了气泡/弹状流测量实验。研究结果表明，容抗消除是克服耦合电容对测量结果不利影响的有效方法。实验结果表明，该方法能够成功实现小通道内气泡/弹状流速度的测量，速度测量精度令人满意。对于三种气泡/弹状流速度测量系统样机，气泡/弹状流速度测量的最大相对误差均小于5%。
