Device and method for liquid jet spray boundary positioning

Abstract

A liquid jet spray boundary positioning device and method, including a sheet laser, a synchronous controller, a CCD camera, and a computer. The spray boundary positioning method includes two steps. First, the image is acquired: the entire shooting process is carried out in a darkroom environment, and the computer cooperates The sheet light laser, synchronous controller and CCD camera work together, the sheet light laser emits pulsed laser sheet light to irradiate the liquid jet spray, the CCD camera focuses on the illuminated spray plane, and the synchronous controller controls the laser sheet light to illuminate The time of spraying is just within the exposure time period of the CCD camera; then image processing: the computer receives multiple images from the CCD camera in real time, and uses the gray integration method to locate the spray boundary, that is, to accumulate the gray value of each point of the multiple images In the integral calculation, the values ​​exceeding the highest gray value are all set to the highest gray value, and finally the gray threshold method is used to extract the spray boundary. The invention can accurately and quickly acquire spray boundary information.

Description

technical field [0001] The invention specifically relates to the fields of optical measurement methods and image processing, and in particular to a device and method for locating the boundary of a liquid jet spray. Background technique [0002] In the background of supersonic vehicle research, the scramjet engine has attracted much attention as the most likely and first realized propulsion method. The atomization effect of kerosene and other liquid fuels inside the scramjet directly determines the combustion efficiency and working performance of the engine. The spatial distribution of the atomized spray is crucial to the combustion efficiency of the engine. Generally, the commonly used indicators for evaluating the spatial distribution of spray include spray cone angle, penetration depth and spanwise distribution, etc. At present, the methods for studying the spatial distribution of spray mainly include direct imaging method, PDA method and Malvern method. Among them, the...

AI Technical Summary

Problems solved by technology

Among them, the PDA method can obtain the spray spatial distribution information more accurately, but most direct imaging methods are often unable to obtain accurate and objective spatial distribution information due to the limitations of imaging quality, data processing methods, and imaging methods themselves.

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