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Chapitre D'ouvrage Année : 2007

Direct numerical simulation of sprays: turbulent dispersion, evaporation and combustion

Résumé

Numerical procedures to describe the dispersion, evaporation and combustion of a polydisperse liquid fuel in a turbulent oxidizer are presented. Direct Numerical Simulation (DNS) allows one to describe accurately the evolution of the fully compressible gas-phase coupled with a Lagrangian description in order to describe two-phase flows. Standard coupling is used for the Eulerian/Lagrangian system while some practical issues related to the reactive source terms are addressed by suggesting a fast single-step Arrhenius law allowing one to capture the main fundamental properties of the flame whatever the local equivalence ratio. Then some basic procedures to describe spray preferential segregation in a turbulent reactor are described. Eventually spray combustion is addressed by first demonstrating the complex interactions caused by the presence of an evaporating liquid phase: definition of various equivalence ratios, apparition of flame instabilities for a unit Lewis number, etc. Then a history of the development of the existing spray combustion diagrams is presented to display the possible flame structures and combustion regimes encountered in spray combustion.

Dates et versions

hal-00767598 , version 1 (20-12-2012)

Identifiants

Citer

Julien Reveillon. Direct numerical simulation of sprays: turbulent dispersion, evaporation and combustion. Marchisio, Daniele L.; Fox, Rodney O. Multiphase reacting flows: modelling and simulation, Springer, pp.229-269, 2007, CISM International Centre for Mechanical Sciences, 978-3-211-72463-7. ⟨10.1007/978-3-211-72464-4_6⟩. ⟨hal-00767598⟩
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