This work is devoted to the investigation and subgrid-scale modeling of intrinsic flame instabilities occurring in the propagation of a deflagration wave. Such instabilities, of hydrodynamic and thermodiffusive origin, are expected to be of particular relevance in recent technological trends such as in the use of hydrogen as a clean energy carrier or as a secondary fuel in hydrogen enriched combustion. A dedicated set of direct numerical simulations is presented and used, in conjunction with coherent literature results, in order to develop scaling arguments for the propagation speed of self-wrinkled flames which are also supported by the outcomes of a weakly non-linear model, namely the Sivashinsky equation. The observed scaling is based on the definition of the number of unstable wavelengths in a reference hydrodynamic lengthscale, in other words the ratio between the neutral or cutoff lengthscale of intrinsic instabilities and the lateral domain of a planar flame. The scalings are then employed to develop an algebraic model for the wrinkling factor in the context of a flame surface density closure approach. An a-priori analysis shows that the model correctly captures the flame wrinkling caused by intrinsic instability at sub grid level. A strategy to include the developed self-wrinkling model in the context of a turbulent combustion model is finally discussed on the basis of the turbulence induced cut-off concept.
Subgrid modeling of intrinsic instabilities in premixed flame propagation / Lapenna, P. E.; Lamioni, R.; Creta, F.. - In: PROCEEDINGS OF THE COMBUSTION INSTITUTE. - ISSN 1540-7489. - 38:2(2021), pp. 2001-2011. [10.1016/j.proci.2020.06.192]
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Titolo: | Subgrid modeling of intrinsic instabilities in premixed flame propagation | |
Autori: | ||
Data di pubblicazione: | 2021 | |
Rivista: | ||
Citazione: | Subgrid modeling of intrinsic instabilities in premixed flame propagation / Lapenna, P. E.; Lamioni, R.; Creta, F.. - In: PROCEEDINGS OF THE COMBUSTION INSTITUTE. - ISSN 1540-7489. - 38:2(2021), pp. 2001-2011. [10.1016/j.proci.2020.06.192] | |
Handle: | http://hdl.handle.net/11573/1452393 | |
Appartiene alla tipologia: | 01a Articolo in rivista |
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