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Two-phase flow digital particle image speed measurement method and device

A technology for particle image velocity measurement and phase flow, which is applied to measurement devices, devices that measure the time required to move a certain distance, and fluid velocity measurement. , the effect of simple working process

Inactive Publication Date: 2005-08-17
ZHEJIANG UNIV
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Problems solved by technology

However, the currently used particle image velocimeter can only be applied to the measurement of single-phase flow, and cannot simultaneously measure the different phases of two-phase flow

Method used

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  • Two-phase flow digital particle image speed measurement method and device
  • Two-phase flow digital particle image speed measurement method and device

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Embodiment Construction

[0025] The present invention uses digital particle image technology to simultaneously measure the velocity of each phase of two-phase flow such as gas-liquid, gas-solid or liquid-solid, and a two-phase flow digital particle image velocity measuring device with a simple optical measurement system to realize instantaneous two-phase flow , The measurement of the whole field.

[0026] The technical solution adopted in the present invention is to use suitable particles to trace the flow of dense-phase fluid, and use a high-speed CCD camera to obtain moving images of two-phase flow, that is, moving images of tracer particles and dispersed phase particles, liquid droplets or bubbles. Since the images of tracer particles and dispersed phase particles, liquid droplets or bubbles have obvious differences in geometric size, gray value, etc., using this information, the dispersed phase particles will be separated by selecting the best threshold value and erosion method in image processing....

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Abstract

This invention discloses a two-phase flow digital particle image speed test method and its device, which uses suitable particles to trace flow of fluids and uses high speed CCD camera to register motion images for tracing particles, liquid drops or gas bubbles, applies an image process method to separate the images of scattered phase particles drops or bubbles from original images and extracts velocities of them from their images and applies an improved cross correlation technology based on quick Fourier transformation to extract the velocity field of the tracing particles to realize the synchronous measurement to the two phase flows with different phase velocity fields. The device includes a HeNe laser, a triple prism and a cylinder lens, a high speed CCD camera, an image collecting card and a control and image process computer.

Description

technical field [0001] The invention relates to a multiphase flow flow field detection method and device, in particular to a two-phase flow digital particle image velocity measurement method and a device thereof. Background technique [0002] Two-phase flow widely exists in thermal energy, aerospace, nuclear energy, chemical industry, metallurgy, petroleum and other projects, as well as in water environment and air pollutant discharge. For example, pneumatic and hydraulic conveying, dust separation and collection, liquid mist spraying, pulverized coal combustion, fluidized bed, solid propellant rocket tail nozzle flow, steam-water two-phase flow in reactor, and flow with bubbles in steelmaking furnace, etc. The current measurement of two-phase flow is mostly modern non-contact measurement based on laser technology, including laser Doppler velocimetry (LDV) and phase Doppler particle analyzer (PDPA or PDA). Although these techniques can realize the simultaneous measurement o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/68G01P5/20
Inventor 阮晓东傅新
Owner ZHEJIANG UNIV
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