Three-dimensional real-time measurement device and method for annular flow flowing liquid film thickness and interface waves

Abstract

The invention discloses a three-dimensional real-time measurement device and method for annular flow flowing liquid film thickness and interface waves. The three-dimensional real-time measurement device is composed of a signal generator, a signal distributor, a conductivity sensor group, a signal processing circuit and a data acquisition device, wherein the signal generator is used for generating a rectangular pulse excitation signal; the signal distributor is used for simultaneously distributing the rectangular pulse excitation signals to all the conductivity sensors; when the liquid film passes through the pipeline, all the conductivity sensors are used for converting the thickness of the liquid film into a current signal; the signal processing circuit is used for rectifying, filtering and amplifying the current signal and then converting the current signal into a voltage signal; and when all the conductivity sensors complete current signal acquisition once, a measurement period is recorded, and the data acquisition device is used for performing fusion processing on voltage signals in the measurement period and then converting the voltage signals into liquid film thickness. The real-time three-dimensional measurement of the flowing liquid film attached to the inner wall surface of the annular flow and the interface wave is realized, and the problem that the interference-free three-dimensional measurement is difficult to realize by the current measurement method is solved.

Description

technical field [0001] The invention belongs to the technical field of liquid film thickness monitoring, and in particular relates to a three-dimensional real-time measuring device and method for annular flow liquid film thickness and interface waves. Background technique [0002] Annular flow is a gas-liquid two-phase flow pattern often encountered in the fields of energy and chemical industry. It is characterized by the fact that most of the liquid forms a film and adheres to the inner wall of the tube, while the gas entrains small droplets in the central area of ​​the tube and flows through at high speed. For example, in the boiler water wall tube bundle, as the water continues to evaporate, an annular flow will be formed at the end of the tube bundle. When the annular flow liquid film evaporates, there will be a heat transfer deterioration area, resulting in overheating of the water wall; in the falling film In the cooler, the characteristics of the liquid film will dire...

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Problems solved by technology

[0006] Aiming at the problems existing in the prior art, the present invention provides a three-dimensional real-time measurement device and method for annular flow liquid film thickness and interface wave, which can solve the interference ...

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