Method for measuring gas-liquid two-phase flow phase interface position based on velocity matching spectrum

Abstract

The invention discloses a method for measuring a gas-liquid two-phase flow phase interface position based on a velocity matching spectrum, which comprises: an ultrasonic transceiver is mounted on a pipe wall of a pipeline provided with a gas-liquid two-phase flow; an ultrasonic transducer transmits ultrasonic pulses to the gas-liquid two-phase flow; echo signals are regulated through a diode peak value envelope detector to acquire echo envelope signals and further to acquire an echo envelope diagram; the echo envelope signal diagram is processed to acquire envelope signal datum; a two-base rapid fourier transformation algorithm is adopted to calculate the envelope signal datum to acquire a velocity spectrum; an abscissa of an intersection point between an oblique straight line corresponding to a peak value of the velocity spectrum and the echo envelope signals is the distance between the ultrasonic transducer and a reflector; and the distance is the phase interface position of the gas-liquid two-phase flow. By adopting the method provided herein, the accuracy and the reliability are high; the phase interface position of the gas-liquid two-phase flow can be measured effectively; the method can be applied to the situations that pipelines and fluids are not transparent; the distribution of the fluids inside the pipelines are not interfered; and the cost is low and the environment is not polluted.

Description

technical field [0001] The invention relates to a method for measuring a gas-liquid interface, in particular to a method for measuring the position of a gas-liquid two-phase flow phase interface based on a velocity matching spectrum. Background technique [0002] Among the current measurement methods for the position of the gas-liquid two-phase flow phase interface, optical methods, high-speed photography methods, electrical impedance (conductance) methods, and ultrasonic methods are widely used. Both the optical method and the high-speed photography method obtain the internal information of the gas-liquid two-phase flow through optical elements, and require the gas-liquid two-phase flow (including the pipe wall in some cases) to have good optical transparency characteristics, which greatly limits such methods. Application of the method in industry. The ray method detects the internal composition of the gas-liquid two-phase flow by emitting rays produced by radioactive subs...

AI Technical Summary

Problems solved by technology

The electrical impedance (conductance) method uses a set of electrodes to detect the electrical impedance (or conductivity) distribution inside the two-phase flow to determine the composition of the two-phase flow. This is a type of contact measurement method. One of the disadvantages is that the electrodes It may cause pollution to the medium or affect the original characteristics of the two-phase flow. The second disadvantage is that the continuous phase medium must have good conductivity.

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