Turbulent jet flames under hot coflow conditions

Abstract

Turbulent jet flames have been under intense investigation for many years. These investigations covered classical topics such as jet spread and decay, flame volume, emission and radiation. More effort was also dedicated to understand the interaction between the turbulence and the chemical kinetics, its impact on flame structure, stability and emission of pollutants. Over the last decade, interest has shifted to jet flames propagating in different coflow environments which are found in practical combustion systems. The temperature, composition and oxygen levels of these coflows have a major impact on the global and local features of these flames. This paper reports a comparison of the difference in fuel mixing rates emerging from a round jet propagating into a hot medium. Such flows include jet in a hot coflow, piloted jet flames, and bluff body flames. The key differences between these and standard flames are reviewed, and the mixing rates are presented and discussed.