Recent Advances in Experimental Studies of Turbulent Premixed Flames

Abstract

Many physical and chemical processes are included in turbulent premixed combustion and interact with each other in a complex way. These are characterized by the turbulence Reynolds number and the Damkohler number. Various regimes of turbulent premixed combustion are identified depending on these dimensionless parameters. In general, two important regimes are identified, namely the wrinkled laminar flame and the distributed reaction zone. Using newly developed experimental techniques, the characteristic features of the wrinkled laminar flame are being revealed and studies on the distributed reaction zone are under way. In the present review, essential problems relating to the modeling of physical processes in the wrinkled laminar flame are first described; secondly, new experimental findings relating to the distributed reaction zone are presented, and finally the transition mechanism of the turbulent premixed flame structure is discussed.