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Different stages of...
Different stages of flame acceleration from slow burning to Chapman-Jouguet deflagration
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- Valiev, Damir (författare)
- Umeå universitet,KTH,Materialvetenskap,Institutionen för fysik,Kungliga Tekniska Högskolan (KTH),Royal Institute of Technology (KTH),Umeå University
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- Bychkov, Vitaly (författare)
- Umeå universitet,Institutionen för fysik,Umeå University
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- Akkerman, V. (författare)
- Umeå universitet,Institutionen för fysik,Umeå University,Princeton University
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- Eriksson, Lars-Erik, 1950 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology,Department of Applied Mechanics, Chalmers University of Technology,Chalmers, Dept Appl Mech, S-41296 Gothenburg, Sweden
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(creator_code:org_t)
- 2009
- 2009
- Engelska.
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Ingår i: Physical Review E. - 2470-0045 .- 2470-0053. ; 80:3, s. 036317-
- Relaterad länk:
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http://dx.doi.org/10...
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https://research.cha...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Numerical simulations of spontaneous flame acceleration are performed within the problem of flame transition to detonation in two-dimensional channels. The acceleration is studied in the extremely wide range of flame front velocity changing by 3 orders of magnitude during the process. Flame accelerates from realistically small initial velocity (with Mach number about 10(-3)) to supersonic speed in the reference frame of the tube walls. It is shown that flame acceleration undergoes three distinctive stages: (1) initial exponential acceleration in the quasi-isobaric regime, (2) almost linear increase in the flame speed to supersonic values, and (3) saturation to a stationary high-speed deflagration velocity. The saturation velocity of deflagration may be correlated with the Chapman-Jouguet deflagration speed. The acceleration develops according to the Shelkin mechanism. Results on the exponential flame acceleration agree well with previous theoretical and numerical studies. The saturation velocity is in line with previous experimental results. Transition of flame acceleration regime from the exponential to the linear one, and then to the constant velocity, happens because of gas compression both ahead and behind the flame front.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- Mach number
- flames
- walls
- nonslip
- mixture
- supersonic
- transition
- flow
- detonation
- turbulent
- combustion
- tubes
- large-eddy simulation
- chemically reactive flow
- channels
- radiated sound
- Physics
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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