Abstract
The work discusses the characteristics of isothermal flow and scalar mixing fields, downstream of a variety of axisymmetric baffles in a double-cavity premixer/disk burner configuration. The scope of the work is to enhance knowledge regarding the impact of fully premixed or stratified, inlet fuel-air mixture conditions on the mixing disposition and fuel-air placement in the recirculating wake of a range of practical flame stabilizers. PIV and FTIR instrumentation are employed to obtain measurements of the mean and turbulent velocity fields and of the fuel concentration topologies throughout the near wake development.The measurements are obtained over a range of inlet conditions and geometric parameters, such as inlet fuel-air mixture profiles, blockage ratios and after- and fore-body stabilizer geometry characteristics. The results help to delineate differences and similarities in the cold flow mixing performance and fuel-air entrainment properties in the near wake of the examined baffles with implications for the flame anchoring and disposition in counterpart reacting configurations. The findings can be suitably exploited for the regulation of inlet mixture profile variations for realizing potential benefits in the optimization of operational stability and the minimization of emissions in the development of combustors.
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