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Second-order Conditional Moment Closure Modelling of Piloted CH4 Turbulent Jet Diffusion Flames

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1270
pages 597-600

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

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

Abstract

The advent of increasingly stringent emissions legislation inevitably leads to a requirement for more accurate modelling of pollutant formation in practical combustion applications. Previous limited success in modelling species such as NO using first-order conditional moment closure (CMC) models indicates the need for more advanced modelling techniques. Here, a method of including higher-order chemistry within a two-dimensional, elliptic CMC framework is presented and investigated, and is subsequently applied to the prediction of three piloted methane jets of varying strain rates. Results are presented from first- and second-order calculations, which are found to be encouraging and in line with expectation. Suggestions are subsequently made in light of this to account for anomalous predictions of nitrous and other species formation, and ongoing investigations regarding the representation of other CMC modelling concerns such as conditional velocity and scalar dissipation are discussed.

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