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Fizika Goreniya i Vzryva, 2006, Volume 42, Issue 1, Pages 49–56 (Mi fgv1560)  

Effect of unmixedness in large eddies on ignition and combustion of turbulent jets of the fuel in a supersonic flow

O. M. Kolesnikov

Joukowski Central Aerohydrodynamic Institute, Zhukovskii, 140160, Russia
Abstract: A method and results of computing the influence of unmixedness in large eddies generated by instability of a contact discontinuity on ignition and combustion of turbulent jets of a fuel in a supersonic flow are presented. The basic system of equations is the Reynolds-averaged Navier–Stokes equations. The influence of unmixedness on chemical reaction rates is reproduced by using a random number generator adjusted in accordance with the probability of origination of favorable conditions for proceeding of chemical reactions, which is computed in each node of the computational grid. The problem of combustion of a plane hydrogen jet injected into a supersonic flow along the plate surface is considered as an example. It is shown that allowance for unmixedness in the case where the flow and the jet have favorable initial parameters for self-ignition leads to a delay in heat release and to origination of pressure and temperature fluctuations. As the parameters approach the self-ignition limit, these fluctuations increase, and the combustion becomes intermittent.
Keywords: combustion, turbulence, unmixedness, large eddies, numerical simulation, supersonic flow.
Received: 12.05.2003
Accepted: 02.03.2004
English version:
Combustion, Explosion and Shock Waves, 2006, Volume 42, Issue 1, Pages 41–47
DOI: https://doi.org/10.1007/s10573-006-0005-y
Bibliographic databases:
Document Type: Article
UDC: 536.46
Language: Russian
Citation: O. M. Kolesnikov, “Effect of unmixedness in large eddies on ignition and combustion of turbulent jets of the fuel in a supersonic flow”, Fizika Goreniya i Vzryva, 42:1 (2006), 49–56; Combustion, Explosion and Shock Waves, 42:1 (2006), 41–47
Citation in format AMSBIB
\Bibitem{Kol06}
\by O.~M.~Kolesnikov
\paper Effect of unmixedness in large eddies on ignition and combustion of turbulent jets of the fuel in a supersonic flow
\jour Fizika Goreniya i Vzryva
\yr 2006
\vol 42
\issue 1
\pages 49--56
\mathnet{http://mi.mathnet.ru/fgv1560}
\elib{https://elibrary.ru/item.asp?id=16542144}
\transl
\jour Combustion, Explosion and Shock Waves
\yr 2006
\vol 42
\issue 1
\pages 41--47
\crossref{https://doi.org/10.1007/s10573-006-0005-y}
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