Similarity and difference of flame-flow interactions in an open tube and in a closed chamber

V.B. Akkerman, V.V. Bychkov, R.J.M. Bastiaans, L.P.H. Goey, de, J.A. Oijen, van, L.E. Eriksson

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Flame propagation through a combination of vortices in an open tube and in a closed chamberresembling a clearance of an SI-engine is investigated using direct numerical simulations of a setof the combustion and hydrodynamic equations. For burning in tubes, we demonstrate how theburning rate depends on the root-mean-square (rms) flow velocity, the vortex size, the thermalexpansion in burning and other flame-flow parameters. The dependence on the vortex intensity(rms-velocity) is almost linear in agreement with the general belief. The dependence on the vortexsize may be imitated by a 2/3 power law. Two cases (of a single-mode vortex array and of a multimodecombination of vortices obeying the Kolmogorov spectrum) are considered. In the case ofburning in a closed chamber, various initial flow conditions in the chamber are studied includinggas at rest and initial sets of vortices of different size / rms-velocities. It is shown that flame-flowinteraction leads to a strong flame corrugation, with noticeable increase in the burning rate. Unlikefor burning in an open tube, there is an optimal vortex size in a closed chamber, which providesthe fastest total burning rate / shortest time of burning.
Original languageEnglish
Title of host publicationProceedings of the 2007 Fall Meeting of the Western States Section of the Combustion Institute,
Place of PublicationUnited States, Sandia National Laboratories, Livermore CA
Pages07F-05
Publication statusPublished - 2007

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