Ultrasonic imaging method and device for axial flow field of fluid in pipeline

Abstract

The invention provides an ultrasonic imaging method and device for an axial flow field of fluid in a pipeline. The method comprises the following steps: distributing a plurality of ultrasonic transducers on the two cross sections at the upstream and the downstream, and detecting the axial flow field by using a tone channel network woven by the transducers; stimulating each transducer in sequence, electronically scanning and collecting ultrasonic signals transmitted by fair current and counter current of each tone channel; calculating average line flow velocity, and obtaining projection integration of the axial flow field on each tone channel; parallelly dividing the tone channels, and subdividing projection data of each tone channel group in an interval manner; using the chromatography imaging algorithm, rebuilding the axial flow field by using the subdivided projection data, and outputting and displaying the axial flow field. The device comprises a flow field detection pipe segment, an ultrasonic signal stimulation and collection module, a tone channel line flow velocity measuring module, an axial flow field reconstruction module and an output and display module. According to the device and the method provided by the invention, quick and accurate no-blind zone detection of the axial flow field on the cross sections of the pipeline can be realized, so that high-precision two-dimensional rebuilding of the axial flow field can be realized accordingly.

Description

Technical field [0001] The invention relates to the technical field of flow velocity measurement using ultrasonic waves, in particular to an ultrasonic imaging method and equipment aimed at the axial flow field of fluid in a pipeline. Background technique [0002] In classical mechanics, fluid flow can be described by Navier Stokes equation. However, as a system of nonlinear partial differential equations, it is very difficult to calculate exact solutions of Navier Stokes equations. Especially in complex flow regimes such as turbulent flow and pulsating flow, the solution complexity will be further improved. Therefore, the solution of engineering problems such as automobile and airplane wind tunnel tests, pipeline flow patterns and flow monitoring, and the advancement of fluid mechanics theoretical research all rely on the acquisition of high-precision experimental results. As the basic physical quantity to describe the flow characteristics, the fluid velocity field is very imp...

AI Technical Summary

Problems solved by technology

Each channel can only obtain ultrasonic signals that propagate in one direction, and the flow velocity measurement results are affected by the temperature drift of sound velocity

At the same time, they used low-frequency ultrasonic probes to meet the requirements of the detection scheme for the divergence angle of the probes, reducing the measurement accuracy of the ultrasonic signal propagation time of each channel

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