Numerical Study of Unsteady Turbulent Premixed Combustion: Application to Flashback Simulation

摘要: Numerical simulation of combustion phenomena such as flashback involves complex interactions between acoustics, turbulence, and combustion. An approach is proposed which combines a large eddy (LES) technique with an adapted flame representation for premixed The standard Smagorinsky model used the subgrid closure. artificially thickened so that it can be resolved on LES mesh. Two-dimensional nonreactive computations are first performed in backward facing step configuration. Spectral analysis pressure velocity signals recorded during calculations compared experimental results. mechanism linked to instabilities sudden expansion configuration then investigated. effects simulated by imposing external modulation at entrance computational domain. Two cases discussed illustrate dynamics flame. Upstream propagation observed response strong flow perturbations.