A characteristic signal image method and measurement system for flow field velocity measurement

A characteristic signal and velocity measurement technology, which is applied in the direction of fluid velocity measurement, velocity/acceleration/shock measurement, measuring device, etc., can solve the problems of low efficiency and achieve the effect of easy operation, fast and accurate measurement

Active Publication Date: 2019-12-31
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0008] Although this method can obtain the average velocity of the corresponding point without disturbing the jet flow field, this method can only obtain the average velocity of a single spatial position at a time, and the efficiency is too low

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  • A characteristic signal image method and measurement system for flow field velocity measurement
  • A characteristic signal image method and measurement system for flow field velocity measurement
  • A characteristic signal image method and measurement system for flow field velocity measurement

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Embodiment Construction

[0040] Such as figure 1 As shown, the characteristic signal image speed measurement method of an embodiment of the present invention generally includes the following steps:

[0041] Step 100, using a high-speed camera to continuously capture images of light intensity fluctuations in the jet flow field, and then sending them to a computer for processing using image analysis software;

[0042] Wherein, the fluid constituting the jet flow field is a luminescent fluid, such as luminol, also known as luminol, and its chemical name is 3-aminophthalhydrazide. The speed of the fluid can be subsonic and supersonic fluids in normal pressure environment, subsonic and supersonic fluids in thin gas environment or high pressure environment, and charged fluid. In addition, the fluid can have its own characteristic signal or an external characteristic signal, such as a low-power power supply that is much lower than the power of the main power supply.

[0043] Step 200, select the measuremen...

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Abstract

The invention provides a characteristic signal image method for velocity measurement of a flow field and a measurement system. The characteristic signal image method includes the steps of continuouslycapturing light intensity fluctuation images of a flow field using a high-speed camera, then acquiring the light intensity of each spatial sequence point in the flow field on each frame image using image analysis software, afterwards, establishing a time sequence of the light intensity at each spatial sequence point according to the chronological order of the time points, obtaining the result ofthe jet velocity distribution at each spatial sequence point on each frame image, next, calculating each frame image by the above steps, and obtaining the flow velocity of each spatial position of thewhole flow field. According to the invention, by the use of the characteristic signal image to measure the flow velocity of the plasma jet, the problem that tracer particles have a difficulty in following the flow field movement in the thin high-speed plasma flow. The two-dimensional distribution of the velocity of the flow field can be measured in an extremely short time, the operation is simpleand convenient, and the instantaneous velocity of a fluid can be quickly and accurately measured without a device intervening in the flow field.

Description

technical field [0001] The invention relates to the field of jet flow field measurement, in particular to a characteristic signal image velocity measurement method for fluid jet flow field velocity measurement. Background technique [0002] The flow velocity of the fluid is the most basic physical quantity of the jet flow field. The understanding of the flow characteristics largely depends on the acquisition of the velocity field, especially in the study of the characteristics of the high-speed jet flow field. important experimental data. At present, the velocity measurement of the jet flow field is mainly divided into two methods: invasive and non-invasive. Intrusive measurement mainly includes Pitot tube and hot wire anemometer. Non-invasive measurement mainly includes laser Doppler method, particle image method, molecular labeling method and jet flow field light intensity disturbance propagation velocimetry method, etc. [0003] The Pitot tube principle is to apply the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P5/20
CPCG01P5/20
Inventor 黄河激曹进文潘文霞孟显于双
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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