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Title: Experimental Study On Velocity Representation Of Ultrasonic Transit - Time Discharge Measurement In Open Channel
Author: H. Hu Z. Wang D. Zhu X. Cheng
Source: Flomeko 2016
Year Published: 2016
Abstract: It is very important to accurately measure the open channel discharge, especially for trade settlement involved in water transportation projects blooming in China. Ultrasonic Transit - time method is widely used for accurate open channel discharge measurement with many advantages. Due to complexity of op en channel flow, velocity representation is the main source of discharge uncertainty, including representation of cross - sectional average d velocity from measured acoustic path velocities and path velocity itself. We buil t a 25m long, 2m wide, 1.2m deep ope n channel facility with an over - fall head tank providing a very stable flowrate of 1.5m 3 /s in maximum. Two parallel - installed DN500 ultrasonic flowmeters calibrated by gravimetric facility are used as master meters, and two open channel flowmeters of diffe rent transducer mounting type are installed in series as test meters for velocity representation study. Both of the two test meters have cross - plane configuration with five acoustic paths on each plane

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