Fundamental flame studies of turbulent premixed combustion

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Turbulent premixed and partially premixed combustion is encountered in most practical combustion devices such as gas turbines, reciprocating engines, and industrial and domestic burners. In gas turbines, lean premixed combustion systems have an intrinsic attraction for controlling the combustion process and are the methods of choice. Fully premixed systems provide control over combustion chemistry, reaction kinetics, flame temperatures, and pollutant emissions. Premixed and partially premixed (stratified) charge concepts used in advanced direct injection spark ignition engines for light duty vehicles have the potential for substantial thermal efficiency improvements.Experiments have shown that turbulence increases the flame propagation rates in premixed combustion. However, the physics behind this effect has not been fully understood yet. One of the leading reasons for this is that the turbulent flame propagation display phenomena that are not common in other turbulent flames. In turbulent premixed flames, interplay of turbulence, thermodynamics, and chemical kinetics leads to a highly complex and convoluted situation. As a result, theoretical models and computational studies are far from explaining the experimental observations.To exploit the potential of lean premixed and partially premixed combustion concepts for practical devices, a better understanding of the underlying physics is essential. The longer term objectives of this proposal is to provide information and new knowledge in the area of turbulent premixed and partially premixed combustion that can be used as tools in design of next generation of gas turbines and other combustion systems.