Correction method of flow measurement properties of single-track ultrasonic water meter

Abstract

The invention discloses a correction method of flow measurement properties of a single-track ultrasonic water meter. The correction method comprises the following steps: 1) respectively calculating surface average flow speeds when a reynold number is an upper limit value of a laminar flow state, a lower limit value of a turbulent flow state and the upper limit value of flow measurement of the water meter; 2) calculating linear average flow speeds corresponding to the surface average flow speeds according to an existing known calibration equation; 3) establishing fitted linear correction equations during the laminar flow state, a transition flow state and the turbulent flow state; and 4) measuring the linear average flow speed Nu through the ultrasonic water meter, comparing Nu with V1 and V2 and performing correction according to the appropriate fitted linear correction equation according to a comparison result. According to the correction method disclosed by the invention, the correction is performed on the flow measurement properties of the ultrasonic water meter by setting the simple linear correction equations under the different flow speed distribution states, and the calculation is simple and fast; and furthermore, the requirements on measurement accuracy of the ultrasonic water meter within a whole flow measurement range can be met by fine adjustment of 2-3 flow points under an actual flow state, and the effects of simplicity, convenience and accuracy can be also achieved.

Description

Technical field [0001] The invention belongs to the technical field of household water meter measurement and detection, and specifically relates to a method for correcting the flow measurement characteristics of a single-channel ultrasonic water meter. Background technique [0002] At present, more than 95% of water meters in use at home and abroad are mechanical water meters. The measurement accuracy of mechanical water meters can only reach level 2 at the highest level, and the flow measurement characteristics of water meters are curved and unadjustable, which can only be guaranteed by design and manufacturing. This will have a greater impact on product quality assurance and manufacturing. [0003] With the increasing shortage of water resources, domestic and foreign water meter standards, water supply companies and the majority of water users all hope that the measurement accuracy and use characteristics of water meters will be significantly improved. And the new generation of...

AI Technical Summary

Problems solved by technology

If the error at both ends of the correction section is to be reduced, the characteristics of the ultrasonic water meter within the flow measurement range must be divided into many sections, and the corrections are performed separately. The result of this is: due to too many correction points, the correction efficiency is low, Can not meet the needs of mass production

Moreover, for the correction in the state of turbulent flow, because it involves complex mathematical formulas such as logarithmic operations, the embedded computer in the ultrasonic water meter is difficult to calculate, and the real-time performance becomes poor; and in the state of transitional flow, because there is no ready-made correction equation, the measurement Accuracy is also problematic

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