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2007.89: Dynamics of laminar triple-flamelet structures in non-premixed turbulent combustion

2007.89: J W Dold, L J Hartley and D Green (1991) Dynamics of laminar triple-flamelet structures in non-premixed turbulent combustion. In: P C Fife, A A Linan and F A Williams, (eds). Dynamical Issues in Combustion Theory. IMA Volumes in Mathematics and its Applications, 35. Springer-Verlag, Berlin, Heidelberg, pp. 83-105. ISBN 0387975837

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In the spirit of laminar-flamelet modelling of non-premixed turbulent combustion, a diffusion flamelet is studied. However, the flamelet is also taken to end at a finite position. Such an end of a diffusion flame exhibits fuel-rich and fuel-lean elements as well as the diffusion flame sheet—a structure that is known as a \emph{triple-flame} and which has the property of being able to propagate. A counterflow geometry with shear becomes the most relevant situation in which to picture ends of diffusion flames in a turbulent flow. In an equidiffusive system, the speed of propagation of the end-point is demonstrated to be positive only for relatively limited values of strain or scalar dissipation rate and becomes large and negative towards the higher finite value at which a diffusion flame would extinguish uniformly. The implications of these findings for the behaviour of turbulent diffusion flames are discussed.

Item Type:Book Section
Subjects:MSC 2000 > 35 Partial differential equations
MSC 2000 > 41 Approximations and expansions
PACS 2003 > 82 Physical chemistry and chemical physics molecular physics
MIMS number:2007.89
Deposited By:Prof John Dold
Deposited On:24 May 2007

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