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Flow-flame interact...
Flow-flame interaction in a closed chamber
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- Akkerman, V. (författare)
- Umeå universitet,Institutionen för fysik
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- Bychkov, Vitaly (författare)
- Umeå universitet,Institutionen för fysik
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- Bastiaans, R. J. M. (författare)
- Technische Universiteit Eindhoven,Eindhoven University of Technology
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- de Goey, L. P. H. (författare)
- Technische Universiteit Eindhoven,Eindhoven University of Technology
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- van Oijen, J. A. (författare)
- Technische Universiteit Eindhoven,Eindhoven University of Technology
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- Eriksson, Lars-Erik, 1950 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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(creator_code:org_t)
- AIP Publishing, 2008
- 2008
- Engelska.
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Ingår i: Physics of Fluids. - : AIP Publishing. - 1070-6631 .- 1089-7666. ; 20:5, s. 21-
- Relaterad länk:
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http://dx.doi.org/10...
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https://doi.org/10.1...
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https://research.cha...
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https://urn.kb.se/re...
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Abstract
Ämnesord
Stäng
- Numerous studies of flame interaction with a single vortex and recent simulations of burning in vortex arrays in open tubes demonstrated the same tendency for the turbulent burning rate proportional to U-rms lambda(2/3), where U-rms is the root-mean-square velocity and lambda is the vortex size. Here, it is demonstrated that this tendency is not universal for turbulent burning. Flame interaction with vortex arrays is investigated for the geometry of a closed burning chamber by using direct numerical simulations of the complete set of gas-dynamic combustion equations. Various initial conditions in the chamber are considered, including gas at rest and several systems of vortices of different intensities and sizes. It is found that the burning rate in a closed chamber (inverse burning time) depends strongly on the vortex intensity; at sufficiently high intensities it increases with U-rms approximately linearly in agreement with the above tendency. On the contrary, dependence of the burning rate on the vortex size is nonmonotonic and qualitatively different from the law lambda(2/3). It is shown that there is an optimal vortex size in a closed chamber, which provides the fastest total burning rate. In the present work, the optimal size is six times smaller than the chamber height.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- ACOUSTIC INSTABILITY
- RADIATED SOUND
- LARGE-EDDY SIMULATION
- HIGH-PRESSURE
- HIGH-TEMPERATURE
- WEAKLY TURBULENT
- BURNING VELOCITIES
- LARGE-SCALE
- FRONT PROPAGATION
- TURBULENT PREMIXED FLAMES
- Fluid mechanics
- fysik
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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