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Towards a predictiv...
Towards a predictive scenario of a burning accident in a mining passage
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Demir, Sinan (författare)
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- Bychkov, Vitaly (författare)
- Umeå universitet,Institutionen för fysik
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Chalagalla, Sri Hari Ramakrishna (författare)
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Akkerman, V'yacheslav (författare)
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(creator_code:org_t)
- 2017-05-31
- 2017
- Engelska.
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Ingår i: Combustion theory and modelling. - : TAYLOR & FRANCIS LTD. - 1364-7830 .- 1741-3559. ; 21:6, s. 997-1022
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Nyckelord
- dust combustion
- mining safety
- fire safety
- Darrieus-Landau instability
- finger flame shape
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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