Acoustic-electric dual-mode measurement method for two-phase flow velocity

A measurement method, dual-modal technology, applied in fluid velocity measurement, average velocity measurement, velocity/acceleration/impact measurement, etc., can solve the problem of large influence on test accuracy, and achieve convenient measurement, low cost, accurate measurement Effect

Active Publication Date: 2018-05-01
TIANJIN UNIV
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Problems solved by technology

In the use of electrical methods and ultrasonic methods to obtain the phase-separated flow velocity of two-phase flow, the cross-correlation velocity measurement method is often used, but the measured velocity is not the total flow velocity of the two phases or the phase-separated flow velocity, which needs to be explained according to parameters such as flow pattern and slip ratio , the test accuracy is greatly affected by the flow state

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  • Acoustic-electric dual-mode measurement method for two-phase flow velocity
  • Acoustic-electric dual-mode measurement method for two-phase flow velocity
  • Acoustic-electric dual-mode measurement method for two-phase flow velocity

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Embodiment Construction

[0025] The calculation method of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] figure 1It is a schematic diagram of the 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. The ultrasonic Doppler probes 3a, 3b and the pipeline 1 are installed at an angle θ, so that the ultrasonic test channel is connected to the two-phase flow 2 The incoming flow direction 0 maintains the 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, the sound waves propagate in the t...

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Abstract

The invention provides a two-phase flow split-phase flow velocity acoustic-electric dual-mode measurement method. The dual-mode sensor used includes a set of electrical sensors and a set of ultrasonic Doppler probes. The measurement method is: using the electrical sensor to collect signals and Obtain the water phase holdup, oil phase holdup and two-phase flow mixing density; determine the measurement space of the ultrasonic Doppler probe, and calculate the equivalent height of the measurement space; calculate the frequency of the ultrasonic signal obtained by the ultrasonic receiving probe and the frequency of the ultrasonic transmitting probe The frequency difference between the excitation ultrasonic signal frequencies, and calculate the average flow velocity in the measurement space; establish the distribution relationship between the fluid flow velocity in the pipeline and the position away from the pipe wall; establish the relationship between the Doppler measurement flow velocity and the boundary layer velocity in the measurement space; Solve to calculate the boundary layer flow velocity; calculate the total flow velocity, and obtain the water phase flow velocity and the oil phase flow velocity respectively. The invention can accurately obtain the phase holdup of two-phase flow in a non-invasive manner.

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 non-disturbance measurement of the flow velocity of a two-phase flow. technical background [0002] Two-phase flow widely exists in industrial processes such as petroleum and chemical industry, such as oil-water two-phase flow, gas-liquid two-phase flow, etc. The accurate measurement of its process parameters will help the optimization and design of industrial processes, improve production efficiency, reduce cost and energy consumption. Due to the strong dynamic coupling between the two phases of oil and water, the flow process is complex and the transient is high, and it is difficult to measure the flow rate and holdup. [0003] The traditional two-phase flow testing methods mostly use invasive testing methods, such as turbine flowmeters and differential pressure flow...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P11/00G01P5/00
Inventor 谭超袁野董虓霄董峰
Owner TIANJIN UNIV
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