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Method for measurement of two-phase flow gas holdup based on ultrasonic two-frequency signal

A dual-frequency signal and ultrasonic technology, applied in the direction of using sonic/ultrasonic/infrasonic waves to analyze fluids, etc., can solve the problems of complex detection principle, large data processing capacity, hindering the two-phase fluid contact detection method, etc. Strong penetrating ability, realizing the effect of online real-time measurement

Active Publication Date: 2015-12-23
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

[0013] The invention provides a method for measuring the gas content of two-phase flow based on ultrasonic dual-frequency signals, so as to solve the problem of using a contact detection method that hinders the flow of the two-phase fluid in the existing gas content measurement technology of two-phase flow, complex detection principles and data processing high volume technical issues

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  • Method for measurement of two-phase flow gas holdup based on ultrasonic two-frequency signal
  • Method for measurement of two-phase flow gas holdup based on ultrasonic two-frequency signal
  • Method for measurement of two-phase flow gas holdup based on ultrasonic two-frequency signal

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[0061] The embodiments of the present invention are described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0062] refer to figure 1 , a preferred embodiment of the present invention provides a method for measuring the gas content of a two-phase flow based on an ultrasonic dual-frequency signal, comprising the following steps:

[0063] Step S100, respectively setting an ultrasonic transmitting probe and an ultrasonic receiving probe at both ends of a straight pipeline that needs to be measured for the gas content of the two-phase flow;

[0064] Step S200, generating two ultrasonic signals with excitation frequencies propagating along the fluid in the straight pipeline, which are respectively a first excitation frequency and a second excitation frequency, by using an ultrasonic transmitting probe;

[0065] Step S300, detecting the characteristic parameters...

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Abstract

The invention discloses a method for measurement of two-phase flow gas holdup based on an ultrasonic two-frequency signal. The method comprises the steps of: arranging an ultrasonic transmitting probe and an ultrasonic receiving probe respectively at both ends of a section of straight pipeline needing two-phase flow gas holdup measurement; by means of the ultrasonic transmitting probe, generating two ultrasonic signals that are propagated along the fluid in the straight pipeline and have the excitation frequencies of a first excitation frequency and a second excitation frequency respectively; detecting the characteristic parameters of the received two ultrasonic signals by the ultrasonic receiving probe; and calculating the gas holdup according to the first excitation frequency, the second excitation frequency, the pure liquid propagation velocity, the resonant frequency of bubbles in the two-phase flow, the bubble vibration damping and the characteristic parameters of the two ultrasonic signals. The ultrasonic probes are installed on the outer wall of the straight pipeline, and are not needed to be arranged in the two-phase flow in the pipeline, thus realizing non-contact measurement of the two-phase flow gas holdup. The data processing amount is very small, and flow of the two-phase flow in the pipeline is not hindered in the measurement process.

Description

technical field [0001] The invention relates to the field of gas content measurement of two-phase flow, in particular to a method for measuring gas content of two-phase flow based on ultrasonic dual-frequency signals. Background technique [0002] Two-phase flow is a very common flow pattern in nature and industrial processes. Due to the complexity of the flow pattern, how to accurately measure the gas content of gas-liquid two-phase flow has always been an important issue to be solved urgently in scientific research and industrial processes. [0003] The methods for measuring the gas content of several gas-liquid two-phase flows recorded in the prior art and their shortcomings are as follows: [0004] 1. Li proposed a method for measuring the gas content of two-phase flow based on γ-ray. The working principle is that when the γ-ray penetrates the fluid, its amplitude will be attenuated, and the attenuation degree is related to the gas content of the two-phase flow. By dete...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/02
Inventor 黄奕勇郑崇光陈勇陈小前
Owner NAT UNIV OF DEFENSE TECH
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