Ultrasonic flow meter accuracy was investigated over a range of flow conditions (3 pipe materials, 2 pipe sizes, 4 Reynolds numbers, 7 flow-disturbing devices) commonly found in irrigation systems. Flow rate measurements were taken at five locations downstream from a flow disturbance. The measurement accuracy was within +/- 5% of actual flow at a minimum of 10 pipe diameters downstream from the flow disturbances. Errors as high as 36.5% occurred when measurements were taken close to some flow disturbances. A multiplier was developed to correct for directional bias for devices that fell into the Group 1 category (single elbow, two elbows, check valve, and 50% open butterfly valve with vertical and horizontal orientation). Applying the multiplier at 4.5 pipe diameters and higher resulted in accuracies within +/- 4% of actual flow. The regression analysis performed on Group 1 devices showed that the USFM performance was not significantly different for the three pipe materials, two pipe diameters, and four flow rates.
Ultrasonic water measurement in irrigation pipelines with disturbed flow
Transactions of the ASAE ; 44 , 4 ; 899-910
2001
12 Seiten, 19 Quellen
Article (Journal)
English
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