Study on the propagation velocity of methane/air pleated flames based on image processing and fractal interpolation
Source abstract
Abstract
A self-developed gas explosion experimental system was used to detonate methane/air mixtures of different concentrations by different ignition methods, and the propagation processes of spherical flames and irregular flames formed by the explosions were recorded using a high-speed camera. Based on image processing and the fractal interpolation method, the propagation velocity of the explosion-stretched flame was calculated. The flame image was processed in MATLAB to optimize the traditional calculation method. Based on fractal theory, a fractal interpolation function was constructed to calculate the propagation velocity at each point on the front of the spherical stretched flame, and then, the laminar combustion velocity of the methane/air mixed balloon flame was obtained. Compared with the numerical simulation and empirical formula, the error in the laminar flame velocity was less than 0.2%, which verifies the correctness of the image processing and fractal interpolation method to calculate the flame propagation velocity. Using this method, the propagation velocity of the irregular fold stretching flame of the methane/air mixture was calculated, and the propagation velocity at each point along the flame front was obtained. The reason why the flame speed of the gas explosion with a high-temperature source was higher than the flame speed of the gas explosion with an electric spark was preliminarily explained.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Combustion and Detonation Processes · Fire dynamics and safety research · Combustion and flame dynamics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Emergency Management and Safety Engineering, China University of Mining and Technology, Beijing , Beijing 100083, China
Funding
National Nature Science Foundation of China · National Key Research and Development Program of China
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