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Modeling of nonreacting and reacting turbulent spray jets using a fully stochastic separated flow approach

De, Santanu ; Lakshmisha, K.N ; Bilger, Robert W

Combustion and Flame, 2011, Vol.158(10), pp.1992-2008 [Periódico revisado por pares]

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  • Título:
    Modeling of nonreacting and reacting turbulent spray jets using a fully stochastic separated flow approach
  • Autor: De, Santanu ; Lakshmisha, K.N ; Bilger, Robert W
  • Assuntos: Spray ; Turbulence ; Combustion ; Mixture Fraction ; Dispersion ; Engineering ; Chemistry
  • É parte de: Combustion and Flame, 2011, Vol.158(10), pp.1992-2008
  • Descrição: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.combustflame.2011.03.006 Byline: Santanu De (a), K.N. Lakshmisha (a), Robert W. Bilger (b) Keywords: Spray; Turbulence; Combustion; Mixture fraction; Dispersion Abstract: Numerical modeling of several turbulent nonreacting and reacting spray jets is carried out using a fully stochastic separated flow (FSSF) approach. As is widely used, the carrier-phase is considered in an Eulerian framework, while the dispersed phase is tracked in a Lagrangian framework following the stochastic separated flow (SSF) model. Various interactions between the two phases are taken into account by means of two-way coupling. Spray evaporation is described using a thermal model with an infinite conductivity in the liquid phase. The gas-phase turbulence terms are closed using the k-I[micro] model. A novel mixture fraction based approach is used to stochastically model the fluctuating temperature and composition in the gas phase and these are then used to refine the estimates of the heat and mass transfer rates between the droplets and the surrounding gas-phase. In classical SSF (CSSF) methods, stochastic fluctuations of only the gas-phase velocity are modeled. Successful implementation of the FSSF approach to turbulent nonreacting and reacting spray jets is demonstrated. Results are compared against experimental measurements as well as with predictions using the CSSF approach for both nonreacting and reacting spray jets. The FSSF approach shows little difference from the CSSF predictions for nonreacting spray jets but differences are significant for reacting spray jets. In general, the FSSF approach gives good predictions of the flame length and structure but further improvements in modeling may be needed to improve the accuracy of some details of the predictions. Author Affiliation: (a) Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560012, India (b) Department of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia Article History: Received 29 November 2010; Revised 10 February 2011; Accepted 14 March 2011
  • Idioma: Inglês

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