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J. Hefei Univ. Tech. (Nat. Sci.)

合肥工业大学学报(自然科学版)

JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY (NATURAL SCIENCE)

Competent Authorities: Ministry of Education of the People's Republic of China

Sponsor by: Hefei University of Technology

ISSN 1000-1646, CN 34-1001/N

Experimental study on monitoring efficiency of Doppler flowmeter under complicated conditions and key influencing factors

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复杂条件下多普勒流量计监测效果分析及关键影响因素试验研究

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Feb.2023, Vol.46 No.2: 229-235

DOI: 10.3969/j.issn.1003-5060.2023.02.013

Authors

DING Rui, GUO Shuai

(School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: At present, the Doppler flowmeter has been increasingly used in the measurement of the discharge of the drainage pipeline in China, but it is difficult to use the Doppler flowmeter in the field because of the obstruction and the filling of water in the drainage pipeline. Based on indoor full-size drainage pipeline test platform, the monitoring effectiveness of the Doppler flowmeter under the complicated conditions was evaluated. Different pipeline blocking degrees were simulated by installing a series of baffles. Under the condition of known inflow, error analysis shows that the velocity is the main factor influencing the monitoring efficiency of the Doppler flowmeter, and low flow and severe pipeline blocking will cause a decline in the accuracy of velocity monitoring. Using the measured liquid level data of free and constant flow, various liquid level-flow relation models were fitted. Based on the information criterion, the superiority evaluation of the models was carried out, and it is shown that the quadratic polynomial is the optimal model under this experimental condition. Based on the measured value of hydraulic elements under different flow conditions, the variation law of liquid level and flow during the pipeline blocking was analyzed, which provides reference for the establishment of the model of liquid level-flow in the pipeline under complicated flow conditions.

Keywords: drainage pipeline; Doppler flowmeter; flow monitoring; liquid level monitoring; information criterion

作者信息

丁睿，郭帅

（合肥工业大学土木与水利工程学院，安徽合肥230009）

摘要和关键词

摘要: 多普勒流量计在我国排水管道流量的测定中得到越来越多的应用,但是实际排水管道普遍存在阻塞、满水等情形,给多普勒流量计的现场使用造成困难。文章基于室内全尺寸排水管道试验平台对复杂条件下的多普勒流量计监测效能进行评估,通过安装一系列挡板模拟不同的管道阻塞程度,在入流量已知的条件下通过误差分析发现流速是影响多普勒流量计监测效果的主要因素,而低流量和严重管道阻塞会导致流速监测准确性下降;利用管道自由恒定出流的实测液位数据拟合多种液位-流量关系模型,基于信息准则对模型进行优良性评价。结果表明:二次多项式为该试验条件下的最佳模型;通过不同流量工况下的水力要素实测值分析管道阻塞时的液位-流量变化规律,为复杂工况下管内液位-流量模型的建立提供了参考。

关键词: 排水管道；多普勒流量计；流量监测；液位监测；信息准则

Funding

安徽省自然科学基金资助项目（1908085QE211）

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