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About the possibility of vibration combustion at internal explosions

Journal: Pozharovzryvobezopastnost/Fire and Explosion Safety (Vol.26, No. 5)

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Page : 13-20

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Vibration combustion is wave process. It is excited in result of interaction of the flame front with a depression wave which is formed as a result of sharp decrease of speed of a thermal emission, because of decrease of burning area at contact of a flame with the walls limiting volume. The flame under the influence of a wave of expansion tries to return to former situation and again to increase burning area. Fluctuations of gas and fluctuation of the combustion zone are as a result generated. Fluctuations amplify - the flame loses stability, combustion accelerates. The more the camera volume, the easier a flame loses stability. There are especially inclined to vibration combustion of mix, showing diffusion and thermal instability. Mixes with a lack of a mild component belong to such mixes. Speed of heat release and pressure in volume change with oscillation frequency of gas that complicates the expirations from volume. The combustion mode at the strong fluctuations passes from the surface in volume that is followed by change of character of a luminescence of the combustion zone. Amplitude value of pressure in waves can exceed several times pressure against the background of which vibration combustion develops. In squared volumes in the mode of vibration combustion the mix which remained in corners as combustion in this case is stabilized in corners burns down. Experiences in which fluctuation of gas was suppressed with a covering of walls with a felt took place without vibration combustion. In self-contained volumes vibration combustion is also excited in result of interaction of the combustion zone with volume walls in this case stabilization it is not required as the expiration of gases does not happen. When smoothing corners of volume vibration combustion quickly stops. Otherwise combustion in corners does not reach as the flame is extended with the expiring gases. It is apparent that the processes happening at vibration combustion cannot be described by means of quasi-stationary representations. Building constructions of buildings of explosive productions need to be counted taking into account possible pressure roughness if there is a threat of emergence of vibration combustion.

Last modified: 2018-10-17 21:56:37