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Theory of flame acc...
Theory of flame acceleration in open/vented obstructed pipes
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- Akkerman, V'yacheslav (författare)
- Center for Alternative Fuels, Engines and Emission (CAFEE), Department of Mechanical and Aerospace Engineering, West Virginia University, WV, Morgantown, United States
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- Sadek, Jad (författare)
- Center for Alternative Fuels, Engines and Emission (CAFEE), Department of Mechanical and Aerospace Engineering, West Virginia University, WV, Morgantown, United States
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- Bychkov, Vitaly, 1968- (författare)
- Umeå universitet,Institutionen för fysik
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(creator_code:org_t)
- Eastern States Section of the Combustion Institute, 2016
- 2016
- Engelska.
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Ingår i: 2016 Spring Technical Meeting of the Eastern States Section of the Combustion Institute, ESSCI 2016. - : Eastern States Section of the Combustion Institute.
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- A shockless, conceptually-laminar formulation on extremely fast flame acceleration in semi-open obstructed pipes [Physical Review Letters 101 (2008) 164501; Combust. Flame 157 (2010) 1012], Refs. [8-9] is extended to pipes with both ends open/vented. The acceleration is devoted to a powerful jet-flow produced by delayed combustion in the pockets between the obstacles, and it leads to a prompt deflagration-to-detonation transition event. Starting with inviscid approximation, the analysis subsequently incorporates the viscous forces (hydraulic resistance). The theory is validated by the recent experiments [http://arxiv.org/abs/1208.6453], Ref. [11]. It is shown that hydraulic resistance is not required to drive the flame acceleration. In contrast, this is a supplementary effect, which actually moderates the acceleration rate. On the other hand, hydraulic resistance plays an important role: it is responsible for the initial delay, before the flame acceleration onset, observed in the experiments. It is demonstrated that flames accelerate strongly in open/vented obstructed pipes, and the acceleration mechanism is qualitatively the same as that in the semi-open ones. However, because of the flame-generated flow distributed upward and downward of the flame front, the acceleration rate in open pipes is noticeably less than that in the semi-open ones.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Annan maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Other Mechanical Engineering (hsv//eng)
Nyckelord
- Deflagration-to-detonation transition
- Flame acceleration
- Flame-flow interaction
- Hydraulic resistance
- Open/vented obstructed pipes
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)