Study on noise-vibration coupling characteristics of premixed methane–air flame propagation in a tube with an acoustic absorption material

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.

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Study on noise-vibration coupling characteristics of premixed methane–air flame propagation in a tube with an acoustic absorption material

Abstract: To study the influence of an acoustic absorbing material on the noise and vibration of a methane–air flame, the flame propagation velocity, overpressure, noise and wall vibration characteristics were investigated in a square plexiglass tube.

Cited by 4 publications

References 17 publications

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