Channel Thinning and the Measurement Method of Gas Ultrasonic Flowmeter Based on Contraction Flow
MAO Xian-yi1,2,CUI Li-shui2,XIE Dai-liang1
1. College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China
Abstract：In order to improve the accuracy level of the low-channel number ultrasonic flowmeter, a low-channel number ultrasonic flowmeter with a shrinking flow structure was designed on the basis of the traditional ultrasonic flowmeter. Focusing on the research content, numerical simulation was used to study the flow field characteristics of the shrinking flow in the reducer, and the geometric parameters of the reducer and the installation method of the ultrasonic probe were determined. Through the air flow experiment, the basic characteristics of the flow measurement of mono and dual channels under contracting flow conditions were studied. The scope of flow studied is 27~432m3/h and the range of pipe diameter is 100~150mm. The research results show that the numerical simulation results of shrinkage flow are consistent with the theoretical model. When the shrinkage ratio of the reducer increases from 2 to 6, the proportion of the uniform area of the measured flow field increases significantly. When the shrinkage ratio is fixed, as the flow rate increases, the boundary layer thickness decreases significantly. Compare the measurement results of ultrasonic flowmeters with different structures and configurations through real flow experiments.The accuracy of the actual flow measurement of single-channel gas ultrasonic flowmeter is superior to that of the traditional single-channel gas ultrasonic flowmeter significantly and is equivalent to the traditional dual-channel gas ultrasonic flowmeter.
毛显谊,崔骊水,谢代梁. 基于收缩流动的气体超声流量计声道稀疏化及测量方法[J]. 计量学报, 2022, 43(10): 1291-1297.
MAO Xian-yi,CUI Li-shui,XIE Dai-liang. Channel Thinning and the Measurement Method of Gas Ultrasonic Flowmeter Based on Contraction Flow. Acta Metrologica Sinica, 2022, 43(10): 1291-1297.
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2022, Vol. 43 
