Flow-flame interaction in a closed chamber

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.

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
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

Bychkov, VitalyUmeå universitet,Institutionen för fysik(Swepub:umu)viby0001 (author)
Bastiaans, R. J. M.Technische Universiteit Eindhoven,Eindhoven University of Technology (author)
de Goey, L. P. H.Technische Universiteit Eindhoven,Eindhoven University of Technology (author)
van Oijen, J. A.Technische Universiteit Eindhoven,Eindhoven University of Technology (author)
Eriksson, Lars-Erik,1950Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)lee (author)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

By the author/editor: Akkerman, V.; Bychkov, Vitaly; Bastiaans, R. J. ...; de Goey, L. P. H ...; van Oijen, J. A.; Eriksson, Lars-E ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Fluid Mechanics ...

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