Two-phase flow velocity acoustoelectric bimodal measuring method

A measurement method, dual-modal technology, applied in fluid velocity measurement, velocity/acceleration/impact measurement, measurement device, etc., which can solve problems such as unclear physical meaning and influence of measurement results.

Active Publication Date: 2015-12-23
TIANJIN UNIV
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Problems solved by technology

Usually, the measurement of two-phase flow velocity (flow rate) by ultrasonic method and electrical method is based on cross-correlation algorithm, and is widely used in scientific research and actual measurement...

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Embodiment Construction

[0027] The calculation method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] figure 1 It is a schematic diagram of ultrasonic Doppler measurement space in the measurement method of the present invention. The ultrasonic Doppler probe used in the patent of the present invention includes an ultrasonic transmitting probe 3a and an ultrasonic receiving probe 3b, and the ultrasonic Doppler probes 3a, 3b and the pipeline 1 are installed at an angle θ, so that the ultrasonic testing path is connected to the two-phase flow 2 The incoming flow direction 0 maintains an included angle θ. The ultrasonic probe 3a is installed on the top of the pipeline, and the ultrasonic probe 3b is installed on the bottom of the pipeline, and it is ensured that the ultrasonic probes 3a, 3b and the center of the pipeline are in the same longitudinal section. The excitation probe 3a emits ultrasonic waves, which propagate in the two-phase...

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Abstract

The invention belongs to the technical field of fluid measurement, and relates to a two-phase flow velocity acoustoelectric bimodal measuring method. The method comprises the following steps: (1) using an electrical sensor to calculate the phase fraction of a two-phase flow based on an electrical capacitance method; (2) calculating the mixed sound velocity of the two-phase flow; (3) determining a measurement space; (4) calculating the average flow velocity of discrete phase in the measurement space through ultrasonic Doppler frequency shift; (5) using a drift model to calculate the average flow velocity in the measurement space; (6) calculating the total flow velocity based on the average flow velocity in the measurement space; and (7) calculating the total average flow velocity and split-phase velocity of the two-phase flow, and further calculating the water-phase apparent velocity and the oil-phase apparent velocity based on the phase fraction obtained by the electrical sensor. The measuring method of the invention has the advantages of convenient measurement, high speed and low cost, and can be used to accurately measure the average flow velocity and phase fraction of a two-phase flow in a pipe.

Description

technical field [0001] The invention belongs to the technical field of fluid measurement, and relates to a measurement method combining an ultrasonic sensor and an electrical sensor, which is used for non-disturbance measurement of the average velocity of two-phase flow. technical background [0002] Two-phase flow exists widely in daily life and industrial production, especially in food processing, bioengineering, chemical industry, metallurgical industry and petroleum industry. Its main forms include oil-water two-phase flow and gas-liquid two-phase flow. Compared with general 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 scholars and industrial circles. For the petroleum industry, the determination of the water cut and flow velocity (flow rate) of oil-water two-phase flow helps to accurately estimate production and ensure production safety. [0003] At present...

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Application Information

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