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Differential Diffusion Modelling in LES with RCCE-Reduced Chemistry

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Abstract

The present work shows results obtained from the incorporation of a soot model into a combined Large Eddy Simulation and Conditional Moment Closure approach to modelling turbulent non-premixed flames. Soot formation is determined via the solution of two transport equations for soot mass fraction and particle number density, where acetylene is employed as the incipient species responsible for soot nucleation. The concentrations of the gaseous species are calculated using a Rate-Controlled Constrain Equilibrium approach to reduce the number of species to solve from a detailed gas-phase kinetic scheme involving 63 species. The study focuses on the influence of differential diffusion of soot particles on soot volume fraction predictions. The results of calculations are compared with experimental data for atmospheric methane flames, Overall, the study demonstrates that the model, when used in conjunction with a representation of differential diffusion effects, is capable of predicting soot formation at a fundamental level in the turbulent non- premixed flames considered.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Imperial College London, Exhibition Road, London, SW7 2AZ, UK

    Salvador Navarro-Martinez

  2. School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Sackville Street, Manchester, M60 1QD, UK

    Stelios Rigopoulos

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  1. Salvador Navarro-Martinez
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  2. Stelios Rigopoulos
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Correspondence to Salvador Navarro-Martinez.

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Navarro-Martinez, S., Rigopoulos, S. Differential Diffusion Modelling in LES with RCCE-Reduced Chemistry. Flow Turbulence Combust 89, 311–328 (2012). https://doi.org/10.1007/s10494-011-9370-z

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  • DOI: https://doi.org/10.1007/s10494-011-9370-z

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