Session: 04-12 Flashback and Blowoff III

Paper Number: 128753

128753 - Experimental Evaluation of a Premixed Swirl-Stabilized Gas Burner With a Focus on Mixture Stratification 

The present work reports an experimental evaluation of the flame stabilization, structure and pollutant emissions for a swirl-stabilized premixed burner at atmospheric conditions. The burner has been designed to accommodate two inlet streams, namely a swirling air and a non-swirling fuel-air mixture, which are fed into a mixing chamber. By modifying the air mass distribution between the swirling and non-swirling streams, the burner can produce different swirl numbers at the chamber, as well as different fuel-air mixture stratification. A central tube acts as a bluff body to help stabilize the flame.

Experimental diagnostics include high speed flame visualization, OH* chemiluminescence and NOx pollutant at the burner outlet. The study has been carried out using both hydrogen and methane as fuels. A sweep of conditions has been carried out to identify the lean blow-off limit over the burner operational map. Results indicate that the lean blow-off limit is strongly affected by the air distribution between the swirling and non-swirling parts. CFD flow evaluations indicate that the effect of this distribution is non-linear, with a maximum in swirl number when 5% of the air is fed through the non-swirling part, consistently with experimental changes in lean blow-off limit trends. Different flame shapes are analyzed over the operational map, where strong differences in lift-off and flame width have been identified.

Presenting Author: Jose M Garcia-Oliver Universitat Politecnica de Valencia

Presenting Author Biography: Dr. José M García-Oliver (https://orcid.org/0000-0002-2676-9681) is Full Professor at UPV. His research activities have been focused on fundamental studies aimed at the description of thermodynamic processes in turbulent reactive flows. These concepts have been applied to liquid spray combustion in internal combustion engines and, more recently, to gas-turbines. In both cases, research has been based upon the combination of both optical diagnostic techniques as well as numerical models. His research career has taken place within the context of research projects both at national and EU level, in some of which he has served as a principal investigator. As a result of such activities, he has published more than 80 peer-reviewed papers (h-index of 25 in WoS), around 50 contributions to international conferences and he has supervised 8 PhD theses. This work has been recognized with 4 research and 1 knowledge-transfer activity period.

Authors:

Raul Payri Universitat Politècnica de València
Jose M Garcia-Oliver Universitat Politecnica de Valencia
Pedro Martí Gómez-Aldaraví Universitat Politècnica de València
Elkin Ramírez Correa Universitat Politècnica de València