Flame turbulence calculating method based on chemiluminescence technology

Abstract

The invention discloses a flame turbulence calculating method based on a chemiluminescence technology, and relates to a method for calculating flame surface density from a flame image so as to represent the flame turbulence. According to the method, the defect that at present, when the flame turbulence degree is indirectly measured through physical quantities such as pressure and speed, the precision is lower, and the application range is narrower is overcome. The implementation method comprises the steps of filling a combustion chamber provided with an optical window with fuel, enabling a synchronous trigger to control the ignition and shooting to be carried out synchronously, and using a high-speed camera to record N flame images at the frame speed of 200 kHz; performing calibration andedge extraction on the N images by combining MATLAB software to obtain a flame contour binary image; setting a heuristic lattice, traversing each pixel point of the N images, calculating the length ofa flame contour line contained in each pixel point, and solving the flame surface density; and averaging the flame surface density values of the N images, and summing the flame surface densities of the pixel points with the same horizontal coordinates to represent the flame turbulence. The method is suitable for the flame turbulence measurement in various combustion occasions.

Description

technical field [0001] The invention relates to a method for calculating the flame turbulence degree through an algorithm from a flame self-illumination image, and belongs to the field of post-processing of flame images. Background technique [0002] In the field of combustion diagnosis, flame turbulence is a parameter that researchers pay more attention to. It can reflect the intensity of flame combustion, and then provide researchers with detailed information on flame development. However, the calculation of flame turbulence is an extremely difficult process. In the field of fluid mechanics, the pulsation velocity is generally used to measure the turbulence. However, in the combustion process, it is very difficult to obtain the pulsation velocity. Several indirect measures measure flame turbulence. If multiple pressure sensors are installed in the combustion chamber, by comparing the pressure change curves of the pressure sensors at the same position under different worki...

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Problems solved by technology

However, there are few reports on the combination of flame surface density and turbulence degree at present, and the detailed solution of flame surface density is also rare, so it is necessary to propose a calculation method of flame surface density and use it to measure the size of turbulence

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