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Electro-acoustic dual-mode measurement method for flow velocities of gas-liquid two-phase slug flow and plug flow

A measurement method, slug flow technology, applied in the direction of fluid velocity measurement, velocity/acceleration/impact measurement, measuring device, etc., can solve problems such as large fluctuations, and achieve the effect of low cost, fast speed and convenient measurement

Active Publication Date: 2017-07-07
TIANJIN UNIV
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Problems solved by technology

However, the fluctuations in the flow process of slug flow and plug flow are relatively large, so it is necessary to eliminate the interference caused by the fluctuation first, and obtain the real flow rate of the gas phase.

Method used

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  • Electro-acoustic dual-mode measurement method for flow velocities of gas-liquid two-phase slug flow and plug flow
  • Electro-acoustic dual-mode measurement method for flow velocities of gas-liquid two-phase slug flow and plug flow
  • Electro-acoustic dual-mode measurement method for flow velocities of gas-liquid two-phase slug flow and plug flow

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Embodiment Construction

[0028] The calculation method of the present invention will be described in detail below with reference to the accompanying drawings.

[0029] figure 1 It is a schematic structural diagram of the double crystal ultrasonic transducer in the measurement method of the present invention. The dual-crystal ultrasonic transducer used in the patent of the present invention includes a receiving piezoelectric ceramic wafer 1a and a transmitting piezoelectric ceramic wafer 1b, both of which are obliquely attached to the acoustic coupling materials 2a and 2b cut into fixed geometric shapes. Between the two parts, a sound insulating material 3 is placed to prevent mutual interference of sound waves. The inclination angles of the wafers 1a and 1b must ensure that the angle between the normal direction of the plane where the wafers are located and the incoming flow direction 0 is θ. A metal casing 4 is installed on the outermost side to protect the overall double crystal transducer. The l...

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Abstract

The invention relates to an electro-acoustic dual-mode measurement method for split-phase flow velocities of a gas-liquid two-phase slug flow and plug flow. An ultrasonic transducer with a dual-piezoelectric ceramic chip arranged inside and a capacitive-conductivity-based electrical sensor are employed. The method comprises: a moisture content time sequence H(t) of a two-phase flow is obtained by using an electrical sensor; a time-frequency analysis is carried out on a received signal and a dispersed phase velocity in measurement space at each time t is calculated; a dispersed phase velocity in the measurement space is calculated; a slug flow and a plug flow are distinguished; a moisture content of a projectile body or a moisture content of an air lock is extracted; a flowing velocity of bubbles in the projectile body and a flowing velocity of the air plug are extracted; a drag force between a continuous phase and a dispersed phase is calculated; a cutting force on the continuous phase by a tube wall is calculated; solving is carried out by using a numerical iteration algorithm to obtain a real flow velocity of a liquid phase in the projectile body or a real flow velocity of a liquid phase in the plug flow is obtained; and a two-phase flow split-phase flowing velocity is calculated.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement, and relates to a measurement method combined with an ultrasonic sensor and an electrical sensor, which is used for the undisturbed measurement of the gas-liquid two-phase slug flow and the split-phase flow velocity of a plug flow. [0002] technical background [0003] Two-phase flow widely exists in daily life and industrial production processes, such as food processing, bioengineering, chemical industry, metallurgical industry and petroleum industry. The main manifestations include gas-liquid two-phase flow, liquid-liquid two-phase flow, liquid-solid flow. Two-phase flow and gas-solid two-phase flow, etc. Compared with single-phase flow, the flow state of two-phase flow is more complex, so the online process parameter detection of two-phase flow has always been the focus of scientific research and industry. When the slug flow and plug flow appear in the pipeline, it will cause a great...

Claims

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Application Information

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IPC IPC(8): G01P5/24G01N27/22G01N27/02
Inventor 谭超董虓霄董峰
Owner TIANJIN UNIV
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