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| Optimization of Flow Measurement Uncertainty in Open Channel With Triangular Thin-Walled Weir Based on Data Fitting Method |
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Abstract Aiming at the problem of low accuracy level of the triangular thin-walled weir open channel meter when it is not used at fixed point, the research on the measurement method was carried out based on the results of the uncertainty pre-assessment. Curve fitting is proposed to replace linear interpolation to calculate the flow coefficients, and a digital output magnetostrictive water level sensor is adopted to measure the water head, which significantly reduces the uncertainty component of the original method. The frequency sampling method is improved based on the Froude's similarity criterion, which improves the accuracy level of the measurement results. The uncertainty of the measurement method was improved from 1.6% to 0.56%. The calibration experiments of the triangular thin-walled weir open-channel flowmeter were carried out by the standard meter method open-channel flow rate standard device, and the experimental results showed that the calibration error (deviation) was reduced from 2% to 1% after the improvement of the measurement method.
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Received: 26 December 2023
Published: 26 September 2024
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2024, Vol. 45 
