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Analysis of Gaseous Fuel-Air Mixing
and Flame Stability
Investigator: Dan Brasoveanu
Overview
New analytical model of fuel-air mixing and flame stability were developed and
tested using experimental data and Computational Fluid Dynamics. The first model
is used for non-flammable mixtures, the second for flames. The models show that
factors that affect mixing and flame stability and quantify their effect. The
first model provides the rate of mixing, and the time and length required for
achieving a flammable mixture. The second model predicts changes in the
composition of flammable mixtures and their effect on flame stability. The
models are valid for any combustor geometry and a variety of fuels and
operational conditions. The models show how to optimize heat transfer, and the
distributions of temperature, pressure and velocity in order to enhance both
mixing and flame stability.
 Effect of velocity divergence on methane-air mixing time for the case with air penetratinginto the fuel flow and for the case with fuel dispersing into the air flow |
 Effect of rate of temperature on methane-air mixing time for the case with air penetrating into the fuel flow |
 Effect of rate of temperature on methane-air mixing time for the case with fuel dispersion into the surrounding air |
Last Edited: May 13, 2006