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Physical Mechanism ...
Physical Mechanism of Ultrafast Flame Acceleration
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- Bychkov, Vitaly (författare)
- Umeå universitet,Institutionen för fysik,Umeå University
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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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- Eriksson, Lars-Erik, 1950 (författare)
- Department of Applied Mechanics, Chalmers University of Technology,Chalmers, Dept Appl Mech, S-41296 Gothenburg, Sweden,Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- 2008
- 2008
- Engelska.
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 101:16, s. 164501-1-164501-4
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Abstract
Ämnesord
Stäng
- We explain the physical mechanism of ultrafast flame acceleration in obstructed channels used in modern experiments on detonation triggering. It is demonstrated that delayed burning between the obstacles creates a powerful jetflow, driving the acceleration. This mechanism is much stronger than the classical Shelkin scenario of flame acceleration due to nonslip at the channel walls. The mechanism under study is independent of the Reynolds number, with turbulence playing only a supplementary role. The flame front accelerates exponentially; the analytical formula for the growth rate is obtained. The theory is validated by extensive direct numerical simulations and comparison to previous experiments.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
Nyckelord
- Computer simulation
- Direct numerical simulation
- Reynolds number
- Analytical formulas
- Channel walls
- Flame accelerations
- Flame fronts
- Physical mechanisms
- Ultrafast
- Physics
- Fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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