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CONDITIONAL MOMENT CLOSURE MODELLING OF SOOT FORMATION IN TURBULENT NON-PREMIXED, ETHYLENE-AIR FLAMES

Yunardi
Energy and Resources Research Institute, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds, West Yorkshire, LS2 9JT, UK

Robert M. Woolley
School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, United Kingdom

Michael Fairweather
School of Chemical and Process Engineering, University of Leeds, Leeds, LS2 9JT, UK

Abstract

Presented are results obtained from the incorporation of a semi-empirical soot model into a first-order Conditional Moment Closure (CMC) approach to modelling turbulent, non-premixed, ethylene-air flames. Soot formation is determined via the solution of two transport equations for the soot mass fraction and the particle number density, with acetylene and benzene employed as the incipient species responsible for soot nucleation. The concentrations of these species are calculated using a detailed gas-phase kinetic scheme involving 463 reactions and 70 species. The study focuses on the influence of differential diffusion of soot particles on soot volume fraction predictions, and the results of calculations are additionally compared with experimental data for the flow field and temperatures of the three ethylene-air flames investigated. Good agreement with soot data is found provided differential diffusion effects are included.