明渠时差法流量计流量计算方法分析研究

Study of ultrasonic flowmeter method for open channel flow calculation

目前国内外对明渠时差法流量计流量计算方法研究较少,对时差法流量计流量计算方法进行系统完整的研究,从时差法测验原理、理论标定系数k1的计算方法、水道断面面积的计算方法、现场标定系数k2的计算方法,详细阐述了明渠时差法流量计流量计算方法,提出了线性插值计算理论标定系数k1的方法。以南水北调输水断面运河站为例采用线性插值计算理论标定系数k1的方法,进行时差法流量计流量计算,计算结果与流速仪法对比显示两者一致性较好,误差可控。进而为工程技术人员提供参考;为国产化时差测流装置提供重要技术支撑;为我国重点通航河道和低流速实时在线流量监测提供技术保障。

At present there is few research on the ultrasonic flow meter method for flow calculation.This paper presents a systematic study on this method.It elaborates on the ultrasonic flow meter method for flow calculation in terms of the principle of ultrasonic test,the calculation method for theoretical calibration coefficient k 1,the calculation method for channel cross-section area,and the calculation method for field calibration coefficient k 2.It puts forward the linear interpolation method for calculating theoretical calibration coefficient k 1.Taking the Yunhe station of the South-to-North Water Transfer Project as a case study,we used linear interpolation to calculate the theoretical calibration coefficient k 1,and calculated the flow by the ultrasonic flowmeter method.The calculation results were compared with the results of the current meter method.The comparison showed good consistency and controllable error.This study can provide a reference for engineering and technical personnel,provide important technical support to the localization of ultrasonic measurement devices,and provide technical support to the real-time online flow monitoring of key navigable channels and low velocity in China.