The interaction of high-speed turbulence with flames: Global properties and internal flame structure
By Alexei Y. Poludnenko, E. Oran. 2009
270 citations recorded by the source corpus.
We study the dynamics and properties of a turbulent flame, formed in the presence of subsonic, high-speed, homogeneous, isotropic Kolmogorov-type turbulence in an unconfined system. Direct numerical simulations are performed with Athena-RFX, a massively parallel, fully compressible, high-order, dimensionally unsplit, reactive flow code. A simplified reaction-diffusion model represents a stoichiometric H2–air mixture. The system being modeled represents turbulent combustion with the Damkohler number Da=0.05 and with the turbulent velocity at the energy injection scale 30 times larger than the laminar flame speed. The simulations show that flame interaction with high-speed turbulence forms a steadily propagating turbulent flame with a flame brush width approximately twice the energy injection scale and a speed four times the laminar flame speed. A method for reconstructing the internal flame structure is described and used to show that the turbulent flame consists of tightly folded flamelets. The reaction zone structure of these is virtually identical to that of the planar laminar flame, while the preheat zone is broadened by approximately a factor of two. Consequently, the system evolution represents turbulent combustion in the thin reaction zone regime. The turbulent cascade fails to penetrate the internal flame structure, and thus the action of small-scale turbulence is suppressed throughout most of the flame. Finally, our results suggest that for stoichiometric H2–air mixtures, any substantial flame broadening by the action of turbulence cannot be expected in all subsonic regimes.
Subfields: Aerospace Engineering, Computational Mechanics
View Paper: https://www.semanticscholar.org/paper/9d0fd38ec5d5182cbcf0b3cf4af319e1af9fe574
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In Aerospace Engineering
In Computational Mechanics
Citations in the corpus
- A multiphase model for compressible granular–gaseous flows: formulation and initial tests (2016, methodology): “…low-dissipation methods for solving the compressible Euler and Navier–Stokes equations are becoming widespread due, in part, to their excellent properties for describing shock waves and compressible turbulence (Grinstein, Margolin & Rider 2007; Thornber et al. 2008; Poludnenko & Oran 2010, 2011).”