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Method for improving measurement accuracy of gas ultrasonic flowmeter

An ultrasonic flowmeter and measurement accuracy technology, applied in liquid/fluid solid measurement, measurement flow/mass flow, measurement devices, etc., can solve problems such as large measurement errors

Active Publication Date: 2016-07-13
TIANJIN UNIV
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Problems solved by technology

[0004] The present invention aims to solve the problem that the calculation formula of the gas ultrasonic flow rate of the traditional time difference method does not match the actual ultrasonic propagation situation, especially the non-linearity of the measurement caused by the medium and high flow rate, resulting in a large measurement error, and provides an improved gas ultrasonic flow meter. The method of measurement accuracy, through the correction of the traditional flow calculation formula, achieves the purpose of reducing the flow measurement error and improving the measurement accuracy

Method used

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  • Method for improving measurement accuracy of gas ultrasonic flowmeter
  • Method for improving measurement accuracy of gas ultrasonic flowmeter
  • Method for improving measurement accuracy of gas ultrasonic flowmeter

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Embodiment Construction

[0014] The following will take the DN100 radial type monophonic gas ultrasonic flowmeter as an example ( figure 1 ), combined with the step method in the technical solution, the parameter setting and implementation method of each step are given:

[0015] Step 1: Ideally, the upstream of the ultrasonic flowmeter will be equipped with a long straight pipe section upstream, so it can be considered that the velocity distribution flowing into the ultrasonic flowmeter satisfies the fully developed turbulent velocity distribution, as shown in the following formula.

[0016] v ( r ) = v m a x ( 1 ...

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Abstract

The invention relates to a method for improving measurement accuracy of a gas ultrasonic flowmeter. The method includes the steps that pipeline diameter, coordinates of a fair current emitting point A, an initial emitting angle, coordinates of a counter current emitting point B, an initial emitting angle, the iteration time step and the maximum iteration step number are given; an iteration end boundary is determined; based on the geometrical acoustics theory, computer programming is used for conducting ray tracking on fair current and counter current conditions to obtain coordinates of all tracking points on fair current and counter current rays; actual ultrasonic wave propagation path lengths (namely actual acoustic paths) are calculated, and the included angles (namely actual ) between tangential directions of all the tracking points and the flowing direction are calculated; a time-difference method gas ultrasonic flowmeter calculating and modifying formula is used for obtaining a flow value. Flow measurement can be more accurate.

Description

Technical field [0001] The invention belongs to the technical field of flow measurement, and relates to a gas ultrasonic flowmeter. Background technique [0002] As a new type of flow meter, ultrasonic flowmeter has developed rapidly in the past ten years and has been widely used in large-scale water conservancy and hydropower projects and natural gas trade settlement. Among them, the time difference ultrasonic flowmeter is the most widely used measurement instrument. Compared with liquid ultrasonic flowmeters, the accuracy of gas ultrasonic flow measurement is more difficult to ensure, and involves more technical problems, which are inseparable from the particularity of the gas medium and the complexity of the flow: the gas density is small, the molecular distance is large, the ultrasonic wave The attenuation is severe during the propagation process, so the received signal is not easy to detect. In addition, the turbulent pulsation of the gas flow is large, and the flow no...

Claims

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Application Information

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IPC IPC(8): G01F1/66
CPCG01F1/66
Inventor 郑丹丹王蜜张涛
Owner TIANJIN UNIV
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