Abstract The paper is devoted to the numerical analysis of the reactive mixture explosion during the accidents at a launch site. The particular scenario concerns the explosion in the unconfined volume after accidental fuel release into the atmosphere. It is shown that the development of intrinsic flame instability results in the generation of compression waves, which occur to be intensified via the mechanism of thermo-acoustic instability. In turn, intensification of the compression waves leads to the formation of strong shock waves and even detonation in the case of a highly reactive mixture. The leading role in this process belongs to the transversal waves generated in the folds of the developed flame surface and propagated along the flame surface. It is the localization of the compression wave inside the reaction zone that causes amplification of the compression wave due to energy release.

    Highlights Free flame propagation in unconfined volume is studied. Two mechanisms of shock waves generation are shown to be related to the flame instability development. The amplification of the shock waves is related to the mechanism of thermo-acoustic instability. Compression wave localization in the reaction zone can be responsible for detonation onset.


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    Title :

    Thermo-acoustic instability in the process of flame propagation and transition to detonation


    Contributors:

    Published in:

    Acta Astronautica ; 181 ; 649-654


    Publication date :

    2021-01-20


    Size :

    6 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English






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