Influence of Flow Swirling on the Aerothermodynamic Behaviour of Flames
M. T. Parra-Santos1, V. Mendoza-García2, R. Szasz3, A. N. Gutkowski4, F. Castro-Ruiz1
1University of Valladolid, 47011 Valladolid, Spain
2University of Tarapacá
3Lund University, 22100 Lund, Sweden
4Lodz University of Technology, 90924 Lodz, Poland
Keywords: reactive flow, recirculation zone, CFD, swirling flows, stretched flames
Pages: 424–430
Abstract
The present work focuses on the numerical simulation of diffusive flames in a confined high-swirl burner. Navier-Stokes equations expressed for a time-dependent, compressible, and three-dimensional flow with finite-rate kinetics are solved for lean methane/air mixtures. A simplified mechanism is used to model the combustion. Non-reactive and reactive cases are contrasted for a swirl number of 0.95. Three flames for swirl numbers of 0, 0.6, and 0.95 are analyzed. In swirling flows, the inner recirculation zone is mainly composed of reaction products, which help in ignition of the incoming fuel. Moreover, the forward stagnation point plays an important role, leading to an azimuthal deflection of the flame front.
DOI: http://dx.doi.org/10.1134/S0010508215040048
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