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Towards a predictive scenario of a burning accident in a mining passage
Umeå University, Faculty of Science and Technology, Department of Physics.
2017 (English)In: Combustion theory and modelling, ISSN 1364-7830, E-ISSN 1741-3559, Vol. 21, no 6, p. 997-1022Article in journal (Refereed) Published
Abstract [en]

To reveal the inner mechanisms of a combustion accident in a coalmine, the key stages and characteristics of premixed flame front evolution such as the flame shapes, propagation speeds, acceleration rates, run-up distances and flame-generated velocity profiles are scrutinised. The theories of globally spherical, expanding flames and of finger-flame acceleration are combined into a general analytical formulation. Two-dimensional and cylindrical mining passages are studied, with noticeably stronger acceleration found in the cylindrical geometry. The entire acceleration scenario may promote the total burning rate by up to two orders of magnitude, to a near-sonic value. Starting with gaseous combustion, the analysis is subsequently extended to gaseous-dusty environments. Specifically, combustible dust (e.g. coal), inert dust (e.g. sand), and their combination are considered, and the influence of the size and concentration of the dust particles is quantified. In particular, small particles influence flame propagation more than large ones, and flame acceleration increases with the concentration of a combustible dust, until the concentration attains a certain limit.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD , 2017. Vol. 21, no 6, p. 997-1022
Keywords [en]
dust combustion, mining safety, fire safety, Darrieus-Landau instability, finger flame shape
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Identifiers
URN: urn:nbn:se:umu:diva-143169DOI: 10.1080/13647830.2017.1328129ISI: 000416606900001OAI: oai:DiVA.org:umu-143169DiVA, id: diva2:1167978
Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2018-06-09Bibliographically approved

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Bychkov, Vitaly

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