Calibration method for gas ultrasonic flowmeter
A flowmeter calibration and ultrasonic technology, applied in the direction of testing/calibrating volume flow, etc., can solve problems such as complex gas flow velocity distribution, and achieve the effect of improving accuracy and efficient methods
Pending Publication Date: 2022-05-31
东华理工大学长江学院
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[0004] However, in actual measurement, due to the complexity of the gas flow velocity distribution, certain errors will be introduced by using the numerical integration process. Without knowing the distribution state of the gas flow field, even if the coefficient correction is introduced, this error still exists and is difficult to avoid.
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[0035] The technical solutions of the present invention will be further described below with reference to the accompanying drawings.
[0036] In order to better adapt to the complex flow field distribution and further improve the accuracy of gas flow measurement, the use of multi-channel ultrasonic gas flow meters can greatly approximate the actual scene. The multi-channel ultrasonic gas flowmeter reasonably arranges multiple channels in different flow layer positions of the pipeline according to certain rules, and each channel can reflect the gas flow in different positions.
[0037] like figure 1 As shown, the present invention adopts a four-channel "X+X" type multi-channel arrangement. Four pairs of ultrasonic transducers are independent of each other. The four pairs of transducers are arranged on the horizontal section of the pipeline at different heights according to the Z method. Every two adjacent channels intersect with each other, and the planes where the four channe...
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Although the disclosure has been described only with respect to a limited number of embodiments, it would be understood by those skilled in the art that benefit from the disclosure that various other embodiments may be designed without leaving the scope of the invention. Therefore, the scope of the invention should only be limited by the attached claims. The invention relates to the field of flowmeter calibration, in particular to a gas ultrasonic flowmeter calibration method. The invention provides a gas ultrasonic flowmeter calibration method based on flow numerical integral error analysis. In order to better adapt to complex flow field distribution and further improve the precision of gas flow measurement, the calibration method for the gas ultrasonic flow meter can be greatly close to an actual scene by adopting a multi-channel ultrasonic gas flow meter. According to the multichannel ultrasonic gas flowmeter, a plurality of sound channels are reasonably arranged at different flow layer positions of a pipeline according to a certain rule, and each sound channel can reflect gas flowing conditions at different positions respectively. According to the method, the flow field state is analyzed through the fluid Reynolds number, and then the relation between the section average flow velocity and the sound channel line average flow velocity in different flow field states is deduced.
Description
technical field [0001] The invention relates to the field of flowmeter calibration, in particular to a method for calibrating a gas ultrasonic flowmeter. Background technique [0002] With the large-scale industrial production, the flow measurement of large pipe diameters is increasing day by day. To develop gas ultrasonic flow measurement instruments, it is necessary to develop and establish a gas flow verification device that can meet the needs and build a calibration system. [0003] Those skilled in the art have established a non-real-flow calibration system for large-diameter gas ultrasonic flowmeters from three aspects of geometric parameter calibration, time parameter calibration, and flow numerical integration error calibration. The flowmeter pipeline is used to measure the geometric parameters, and the coordinate measuring instrument can give a complete description of the geometric shape of the measuring pipe section and the probe, which reduces the uncertainty of t...
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IPC IPC(8): G01F25/10
Inventor 胡开明李跃忠王怀平
Owner 东华理工大学长江学院