Two-phase flow phase-splitting flow velocity acoustic-electric bimodal measuring method

Abstract

The invention provides a two-phase flow phase-splitting flow velocity acoustic-electric bimodal measuring method. A used bimodal sensor comprises an electric sensor and an ultrasonic Doppler probe. The measuring method comprises: acquiring a signal and acquiring water phase volume fraction, oil phase volume fraction, and two-phase flow mixed density by using the electric sensor; determining the measuring space of the ultrasonic Doppler probe and computing the equivalent height of the measuring space; computing a difference between ultrasonic signal frequency acquired by a ultrasonic receiving probe and exciting ultrasonic signal frequency emitted from a ultrasonic emitting probe and computing average flow velocity in the measuring space; establishing a fluid flow velocity distribution relation of a position in a pipeline and a certain distance to the wall of the pipeline; establishing a relation between Doppler measurement flow velocity and boundary layer flow velocity in the measuring space; solving the boundary layer flow velocity; and computing total flow velocity and acquiring the water phase flow velocity and oil phase flow velocity. The two-phase flow phase-splitting flow velocity acoustic-electric bimodal measuring method may accurately acquire two-phase flow phase volume fraction by a noninvasive mode.

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 two-phase flow velocity. technical background [0002] Two-phase flow exists widely in industrial processes such as petroleum and chemical industry, such as oil-water two-phase flow, gas-liquid two-phase flow, etc. 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 characteristics between the oil and water phases, the flow process is complex and transient, making it difficult to measure the flow velocity and holdup. [0003] Traditional two-phase flow test methods mostly use intrusive test methods, such as turbine flowmeters and differential pressure flowmeters, etc., which will cause dis...

AI Technical Summary

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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