Dounia, Omar and Vermorel, Olivier and Misdariis, Antony and Poinsot, Thierry
Influence of kinetics on DDT simulations.
(2019)
Combustion and Flame, 200. 1-14. ISSN 0010-2180
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(Document in English)
PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 7MB |
Official URL: https://doi.org/10.1016/j.combustflame.2018.11.009
Abstract
Deflagration to Detonation Transition (DDT) is an intricate problem that has been tackled numerically, until recently, using single-step chemical schemes. These studies (summarized in Oran and Gamezo, 2007) [1] showed that DDT is triggered when a gradient of reactivity forms inside a pocket of unreacted material. However, recent numerical simulations of hydrogen/air explosions using detailed reaction mechanisms (Liberman et al., 2010; Ivanov et al., 2011) [2], [3] showed that detonation waves can emerge from the flame brush, unlike what was usually seen in the single-step simulations. The present work focuses on chemistry modeling and its impact on DDT. Using the idealized Hot Spot (HS) problem with constant temperature gradient, this study shows that, in the case of hydrogen/air mixtures, the multi-step chemical description is far more restrictive than the single-step model when it comes to the necessary conditions for a hot spot to lead to detonation. A gas explosion scenario in a confined and obstructed channel filled with an hydrogen/air mixture is then considered. In accordance with the HS analysis, the Zeldovich’s (1970) mechanism [4] is responsible for the detonation initiation in the single-step case, whereas another process, directly involving the deflagration front, initiated DDT in the complex chemistry case. In the latter, a shock focusing event leads to DDT in the flame brush through Pressure Pulse (PP) amplification
Item Type: | Article |
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HAL Id: | hal-02061780 |
Audience (journal): | International peer-reviewed journal |
Uncontrolled Keywords: | |
Institution: | Other partners > Airbus (FRANCE) French research institutions > Centre National d'Études Spatiales - CNES (FRANCE) French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE) Other partners > EDF (FRANCE) Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE) French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE) Other partners > Total (FRANCE) Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE) Other partners > Météo France (FRANCE) Other partners > SAFRAN (FRANCE) |
Laboratory name: | |
Statistics: | download |
Deposited By: | Thierry POINSOT |
Deposited On: | 08 Mar 2019 11:44 |
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