Method for measuring liquid capacity of pipeline based on ultrasonic guided wave technology

Abstract

The invention relates to a method for measuring liquid capacity of a pipeline based on ultrasonic guided wave technology, belonging to the technical field of testing and measuring and nondestructive testing. The method selects a longitudinal mode of the ultrasonic guided wave for measuring the liquid capacity of the pipeline, wherein, the longitudinal mode of the ultrasonic guided wave has an absolute value of group velocity at an excitation frequency position lower than 0.002m along with frequency variation rate, an average value of liquid distribution of axial displacement in the pipeline is more than 30 percent of the average value distributed on the pipeline wall, and the group velocity is monotonically increasing or reducing along with liquid flow rate in the pipeline. The method can measure the volume of the liquid capacity in a pipeline, in particular to a pipeline with small diameter, quickly and effectively.

Description

technical field [0001] The invention relates to a pipeline liquid flow measurement method based on ultrasonic guided wave technology, and belongs to the technical field of test measurement and non-destructive testing. Background technique [0002] In industries such as aerospace, nuclear industry, electric power, refrigeration, food, and pharmaceuticals, pipelines with small diameters (less than 100mm, even less than 10mm) are widely used to transmit liquids. As an important parameter, the flow rate is one of the necessary control parameters in the process flow. How to realize its real-time, accurate and convenient measurement is one of the difficult problems in the field of flow measurement. According to different working conditions, using different types of flowmeters (such as differential pressure flowmeters, electromagnetic flowmeters, Coriolis mass flowmeters, etc.) Applications. However, based on the complexity of the on-site pipeline conditions, the diversity of tr...

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Problems solved by technology

The longitudinal mode selected in this paper is less sensitive to the change of liquid flow and has serious dispersion, which affects the accuracy of ultrasonic guided wave technology for liquid flow measurement and the application potential of ultrasonic guided wave technology for liquid flow measurement, and does not consider the ultrasonic guided wave technology. The excitation method of the longitudinal mode, the non-axisymmetric excitation method used in this paper cannot effectively generate the selected axisymmetric longitudinal mode

[0005] At present, there have been no relevant reports on the optimization of the ultrasonic guided wave longitudinal mode and its excitation method for pipeline liquid flow measurement.

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