Session: 04-36: Combustion Dynamics - Spray Flames

Paper Number: 102448

102448 - Comparison of the Flame Dynamics of a Liquid Fueled Swirl Stabilized Combustor for Different Degrees of Fuel-Air Premixing 

This study investigates the flame dynamics of lean premixed kerosene combustion for two different degrees of fuel-air premixing using a swirl stabilized burner with an axially movable twin fluid fuel injection nozzle. NOx emission measurements are presented to demonstrate that the degree of fuel-air premixing is significantly varied with the nozzle position. Flame Transfer Functions (FTF) are measured for a systematic variation of thermal power, equivalence ratio and atomization air mass flow for both nozzle positions investigated. As a basis for interpreting the impact of spray quality and convective delay time, stationary flame images and measurements of the droplet size distribution at the nozzle exit are provided along with the FTF for all operation points. Results show that the FTF for the two different configurations differ most in the low frequency range where the influence of the droplet dynamics is expected to be highest. The high premix case has a significantly increased FTF amplitude in this range. For both configurations investigated, a variation of the atomization quality has an impact on flame shape and FTF, but the trends are opposed in the two cases. A variation of the convective delay time does not affect flame shape and FTF for both configurations.

Presenting Author: Jan Kaufmann Technical University of Munich

Presenting Author Biography: - Master degree (M.Sc.) in Aerospace at Technical University of Munich (TUM)
- Ph. D. student and research assistant at the Chair of Thermodynamics at Technical University of Munich (TUM) under supervision of Professor Thomas Sattelmayer
- Research field: combustion instabilities in lean premixed swirl stabilized combustors

Authors:

Jan Kaufmann Technical University of Munich
Manuel Vogel Technical University of Munich
Thomas Sattelmayer Technical University of Munich