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Rapid liquid mist characteristic measuring method based on digital image treatment technique

A liquid mist characteristic and digital image technology, which is applied in the field of non-contact liquid mist characteristic measurement, can solve the problems of different measurement of liquid atomization field characteristic parameters, insufficient measurement parameters, narrow measurement range, etc., and achieve detailed liquid mist characteristic parameters. , reduce measurement costs, and achieve fast results

Inactive Publication Date: 2014-09-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

The parameters for evaluating the quality of atomization are mainly the size distribution and spatial distribution of droplets. Among the literature (papers, reports and patents) published so far, LDV, PDPA, PDA and Malvern particle size analyzer, etc., can be developed by modern optical methods. The test technology measures the liquid mist field, but its measurement cost is high, it is not easy to operate, and the measurement range is narrow, so it cannot measure the entire field, and different measurement technologies have different measurements of the characteristic parameters of the liquid atomization field. The parameters are not comprehensive enough

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  • Rapid liquid mist characteristic measuring method based on digital image treatment technique
  • Rapid liquid mist characteristic measuring method based on digital image treatment technique
  • Rapid liquid mist characteristic measuring method based on digital image treatment technique

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[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031] A kind of rapid measurement method of liquid mist characteristic based on digital image processing technology of the present invention, such as figure 1 shown, including the following steps:

[0032] Step 1: Collect images of the liquid mist with a CCD camera to obtain liquid mist images such as figure 2 shown.

[0033] Step 2, using piecewise linear grayscale transform (GST) processing technology to perform grayscale processing on the image obtained in step 1, such as image 3 As shown, the gray scale of the image is divided into 3 segments, and the gray scale linear transformation is performed on each segment, and the pixel points with gray scale values ​​between 0 and x1 are compressed into gray scale values ​​from 0 to y1, and the gray scale values The compressed gray value of pixels between x2 and 255 is y2 to 255. And stretch the gray ...

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Abstract

The invention provides a rapid liquid mist characteristic measuring method based on a digital image treatment technique. The measuring method comprises the following steps: acquiring an image of a liquid mist field through a CCD (Charge Coupled Device) camera, performing gray processing, subsequently extracting liquid drop information in the image by a Roberts edge detection algorithm, calculating the SMD (Sauter Mean Diameter) of different areas of the liquid mist field, accounting the number of liquid drops in the different areas and the number of liquid drops with different diameters so as to obtain the distribution of the number of the liquid drops in the different areas, the distribution of the liquid drops with different diameters, the density distribution of the liquid drops, the volume distribution of the liquid drops, the accumulation volume distribution of the liquid drops, the average MMD (Mass Median Diameter) and the evenness indexes of the liquid drops, and inputting the data into Tecplot software to output a change curve and cloud distribution of the liquid mist characteristic parameters. The measuring method is high in measurement precision, high in speed and high in efficiency and is capable of performing batch processing on multiple liquid mist images and capable of further improving the measurement precision by increasing the sampling frequency, the liquid mist characteristic parameters are detailed, stable and reliable, and the measurement cost is effectively lowered.

Description

technical field [0001] The invention relates to the field of non-contact liquid mist characteristic measurement, in particular to a liquid mist characteristic rapid measurement method based on digital image processing technology. Background technique [0002] In the spray system and other industrial production processes, the atomization of liquid jet plays an important role in increasing the effective contact area between gas and liquid and strengthening the heat transfer and mass transfer between gas and liquid. The parameters for evaluating atomization quality are mainly the size distribution and spatial distribution of droplets. Among the literature (papers, reports and patents) published so far, LDV, PDPA, PDA and Malvern particle size analyzer, etc., can be developed by modern optical methods. The test technology measures the liquid mist field, but its measurement cost is high, it is not easy to operate, and the measurement range is narrow, so it cannot measure the enti...

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Application Information

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IPC IPC(8): G01N15/02
Inventor 金仁瀚刘勇朱冬清李鹏飞王锁芳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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