A device for measuring the circumferential liquid film thickness of gas-liquid two-phase flow based on ultrasonic

Abstract

The invention relates to a device for measuring the circumferential liquid film thickness of a gas-liquid two-phase flow based on ultrasound, which includes an ultrasonic transducer, a measuring pipe and flanges fixed at both ends of the measuring pipe, and a plurality of openings are arranged on the outer wall of the measuring pipe in the circumferential direction. hole, and a fixed sleeve is provided, and a plurality of through holes penetrating the fixed sleeve are also arranged at the position opposite to the circumferential direction of the fixed sleeve and the outer wall of the measuring pipe, and each through hole on the fixed sleeve is penetrated on one side of the fixed sleeve. It is used to lead out the cable port of the ultrasonic transducer. The fixed sleeve is fixedly connected with the measuring pipe. The openings of the measuring pipe are respectively aligned with the through holes of the fixed sleeve. thread, and the ultrasonic transducer is fixed in the through hole by pressing the screw; the flange is a widened flange, and the flanges at both ends are fixedly connected by tightening the lead screw.

Description

technical field [0001] The invention relates to a device for measuring the circumferential liquid film thickness of a gas-liquid two-phase flow based on ultrasound. Background technique [0002] As one of the most common multiphase flows in the engineering field, gas-liquid two-phase flow includes a variety of complex flow patterns. The annular flow is one of the important research flow patterns in the gas-liquid two-phase flow. The velocity of the gas phase and liquid phase is relatively high, and a disturbance wave is formed at the gas-liquid interface. It is of great significance to study the flow mechanism and evolution law of liquid two-phase flow. Compared with electrical and optical methods, ultrasonic methods have the characteristics of simple structure, strong penetrability, and strong adaptability to working conditions. [0003] At present, scholars at home and abroad mostly use the ultrasonic pulse reflection method to measure the thickness of the liquid film at...

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Problems solved by technology

[0004] (1) The measurement of the liquid film at the bottom of the pipeline requires one transducer, and the method of bundling is relatively simple, while the measurement of the thickness of the circumferential liquid film requires multiple transducers, such as 12 transducers, and the method of bundling will inevitably cause a gap between the transducers. mutual influence, and the installation is extremely inconvenient

[0005] (2) In non-invasive ultrasonic measurement, a sound-transmitting medium, that is, coupling agent, is added between the transducer and the pipeline, so the fit between the transducer and the pipeline will inevitably affect the strength of the ultrasonic echo signal. With the traditional bundling method, the fit is difficult to adjust, which will affect the signal strength

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