|
|
|
| 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.
|
|
Received: 20 April 2021
Published: 14 October 2022
|
|
|
| Fund:the National Key Research and Development Program of China |
|
|
|
［1］贾承造, 张永峰, 赵霞. 中国天然气工业发展前景与挑战［J］. 天然气工业, 2014, 34(2): 1-11.
Jia C Z, Zhang Y F, Zhao X. Prospects of and challenges to natural gas industry development in China［J］. Natural Gas Industry, 2014, 34(2): 1-11.
［2］许瑞祥, 姚依国, 翟恒涛, 等. 不同管径下外夹式超声流量计仪表系数的实验研究［J］. 计量学报, 2020, 41(z1): 63-67.
Xu R X, Yao Y G, Zhai H T, et all. Experimental Study on Meters Factor of Clamp-on Type Ultrasonic Flowmeter with Different Pipe Diameters［J］. Acta Metrologica Sinica, 2020, 41(z1): 63-67.
［3］Zheng D, Lü S H, Mao Y. Effect mechanism of non-ideal flow field on acoustic field in gas ultrasonic flowmeter［J］. IET Science Measurement Technology, 2019, 13(4):469-477.
［4］Temperler N C, Behnia M, Collings A F. Flow patterns in an ultrasonic liquid flow meter［J］. Flow Measurement and Instrumentation, 2000, 11(1): 11-18.
［5］Sun Y, Zhang T, Zheng D. New Analysis Scheme of Flow-Acoustic Coupling for Gas Ultrasonic Flowmeter with Vortex near the Transducer ［J］. Sensors, 2018, 18(4): 1151.
［6］Chen J, Zhang K, Wang L, et al. Design of a High Precision Ultrasonic Gas Flowmeter［J］. Sensors, 2020, 20(17):4804.
［7］陈红, 聂西利, 丁渊明. 超声波流量计整流器设计及验证［J］. 自动化仪表, 2018, 39(7): 91-93.
Chen H, Nie X L, DING Yuanming. Design and Verification of the Ultrasonic Flowmeter Rectifier［J］. Process Automation Instrumentation, 2018, 39(7):91-93.
［8］Ball C G, Fellouah H, Pollard A. The flow field in turbulent round free jets［J］. Progress in Aerospace Sciences, 2012, 50(none): 1-26.
［9］Feedman E, Otugen M V, Kim S. Effect of Initial Velocity Profile on the Development of Round Jets［J］. Journal of Propulsion and Power, 2012, 16(4): 676-686.
［10］Gngr M A. Analyzing the Fluid Flow of Transit-Time Ultrasonic Flowmeter with Image Processing Technique and Developing a Quality Metric Depending on Pipe Profile［J］. Balkan Journal of Electrical and Computer Engineering, 2020, 8(3): 193-200.
［11］崔航, 胡鹤鸣, 李丽霞, 等. 基于激光跟踪仪的超声流量计几何参数实测方法［J］. 计量学报, 2020, 41(9): 1082-1088.
Cui H, Hu H M, Li X, et al. Geometric Parameter Measurement of Ultrasonic Flowmeter Based on Laser Tracker［J］. Acta Metrologica Sinica, 2020, 41(9): 1082-1088.
［12］王帅, 刘小康, 陆龙生. 直流式低速风洞收缩段收缩曲线的仿真分析［J］. 机床与液压, 2012(11): 100-104.
Wang S, Liu X K, Lu L S. Numerical Analysis on Contraction Curve of Low-speed Blow down Wind Tunnel［J］. Machine Tool & Hydraulics, 2012(11): 100-104.
［13］Fang F M. A Design Method for Contractions with Square End Sections［J］. Journal of Fluids Engineering, 1997, 119(2): 454-458.
［14］Abdel R A. A Review of Effects of Initial and Boundary Conditions on Turbulent Jets［J］. WSEAS Transactions on Fluid Mechanics, 2010, 5(4): 257-275.
［15］Zhang H, Jia L, Cui L S, et al. The Development of Top-Hat Flow Field in a Circular Symmetrical Subsonic Nozzle［J］. Institute of Engineering Thermophysics. 2019,28(5): 975-983.
［16］JJG 1030—2007 超声流量计检定规程［S］. 2007. |
|
|
|
2022, Vol. 43 
