Characterization of Nonpremixed Turbulent Bluff Body Burner Flames. Annual Report, January-December 1992

摘要

NOx and flame stability of confined and unconfined bluff body burners have been characterized. This was achieved by obtaining detailed imaging, sampling probe and LDV measurements. The experimental results have been complemented with detailed vortex dynamics and flame structure predictions. In the report, NOx sampling data are used to define the key parameter controlling confined flame NOx. NO imaging data are obtained at two rotational levels near the base of a lifted jet flame. This data and model predictions show that low NO levels are produced when flame stretch is high and local residence time is low. Two component LDV data obtained through cylindrical glass confinements is used to characterize the effect of confinement on recirculation zone and flame stability. The nonreacting vortex dynamics model is validated by experimental data and an unsteady thin flame model is developed for incorporation into the model.