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The University of Southampton

Research project: Stratified Combustion Physics and Modelling

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Stratified combustion occurs when the fuel-air mixture is partly, but not perfectly, mixed before combustion. In advanced power and propulsion systems, stratified combustion occurs where designers use very lean or low temperature premixed combustion to achieve low nitrous oxide emissions, and then add local pockets of fuel-rich mixture in order to achieve acceptable flame stability and ignitability.

Direct Numerical Simulations of turbulent combustion (with 300 Million grid points), employing realistic models for combustion chemistry and molecular transport (27 reactive scalars), are used to provide full-resolution data in which to investigate the fundamental impact, and practical modelling, for effects of fuel-air stratification.

This project is a collaboration with Sandia National Laboratories (California), with computing resources provided by the NCCS(ORNL), and NERSC(LBNL) in the USA.

Figure one: Turbulent stratified jet flame, with heat release surfaces coloured by mixture fraction (a measure of the fuel-air ratio). Volume rendering by Hongfeng Yu, Sandia National Laboratories.

Figure one
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