Iterative ultrasonic tomography method for axial flow field imaging in pipeline

Abstract

The invention provides an iterative ultrasonic tomography method for the axial flow field imaging in a pipeline. The method comprises the steps of constructing a dense sound channel network by ultrasonic sensors large in emission angle and arranged on the upstream and downstream cross sections of a pipeline, exciting to receive an ultrasonic signal, acquiring the average flow velocity of the axial flow field of the pipeline along each sound channel through calculating the time for the ultrasonic wave to spread in the clockwise direction of each sound channel so as to obtain a plurality of original projection data, grouping the projection data into parallel sound channel groups for interpolation and subdivision, expanding the number of projection data, discretizing a to-be-constructed pipeline axial flow velocity field image, and reconstructing a pipeline axial flow velocity field through the iterative tomography of projection data in the prior constraint condition. According to the technical scheme of the invention, on the condition that the original fluid state is not disturbed, the distribution of the axial flow field in the pipeline can be detected. Furthermore, the high-precision reconstruction of the axial flow field of the pipeline is realized.

Description

technical field [0001] The invention belongs to the technical field of information science and is applied to the measurement of the internal fluid flow velocity in a pipeline transportation system, in particular to an iterative ultrasonic tomography method for imaging the axial flow field in the pipeline. Background technique [0002] In daily life and industrial production, in order to realize the transportation of materials and the conversion of energy, some open channels and pipelines are often constructed to actively apply the flow phenomena in nature. Quantitative characterization of the axial flow field in the pipeline is of great significance in many aspects, such as realizing high-precision flow measurement, studying the theory of fluid mechanics, and solving engineering problems related to fluid mechanics. [0003] The early flow field measurement method was developed by measuring the flow velocity at different points in space, also known as the base point method, a...

AI Technical Summary

Problems solved by technology

Since the ultrasonic wave propagates in one direction in the direction of each channel, the ultrasonic propagation speed in the zero flow state is used as the calibration data when calculating the flow velocity, so the measurement result is greatly affected by the fluid temperature

In addition, the measurement accuracy of this arrangement is greatly affected by the cross flow of the pipeline and the imaging resolution at the axis of the pipeline is low

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