Session: 04-47 Combustor Design V
Paper Number: 127761
127761 - Investigating the Impact of Steam Enhancement on Combustion in a Swirl-Assisted Jet-Stabilized Gas Turbine Combustor
A newly developed gas turbine combustor system based on the swirl-assisted jet-stabilized concept using superheated liquid fuel atomization is tested under wet conditions to evaluate its combustion characteristics in the presence of steam. The effect of steam injection into the gas turbine combustor under both spray and superheated liquid fuel injection conditions is studied experimentally on an atmospheric test rig. Superheated injection (flash atomization) uses a thermal breakup mechanism to produce very fine fuel droplets. The experiments are conducted at atmospheric pressure and an elevated combustion air temperature of 580K using Jet A-1 and natural gas as reference fuel. To evaluate the effect of steam injection on combustion performance, the water-to-gas ratio (WGR) is varied from 0 – 30%. Even at very high WGR levels, the results show virtually no combustion thermoacoustic instability during operation. It is shown that the reduction of the combustion zone temperature due to the steam acting as a heat sink, especially in the superheated fuel condition, is the main cause of the NOx reduction (-50%). For both wet and dry conditions, CO levels remained fairly similar. Both flame length and flame height above the burner increased with increasing WGR. This is due to the reduced reactivity of the fuel/air mixture. The operating range of the burner remained fairly constant for Jet A-1, while it decreased significantly with increasing WGR for natural gas combustion. While the effect of WGR on NOx and CO was similar, its greatest effect was on flame height above the burner.
Presenting Author: Jan Zanger German Aerospace Center (DLR), Institute of Combustion Technology
Presenting Author Biography: 2000 - 2007 Aerospace Engineering at University of Stuttgart (Germany)
2007 – 2017 Research Associate at the Institute of Combustion Technology (DLR)
2015 PHD in “Aerospace Engineering” at the Institute of Combustion Technology (DLR)
Since 2017 Group Leader “Validation” at the Institute of Combustion Technology (DLR)
Authors:
Saeed Izadi German Aerospace Center (DLR), Institute of Combustion TechnologyOliver Kislat German Aerospace Center (DLR), Institute of Combustion Technology
Jan Zanger German Aerospace Center (DLR), Institute of Combustion Technology
Hannah Seliger-Ost German Aerospace Center (DLR), Institute of Combustion Technology
Peter Kutne German Aerospace Center (DLR), Institute of Combustion Technology
Manfred Aigner German Aerospace Center (DLR), Institute of Combustion Technology
Investigating the Impact of Steam Enhancement on Combustion in a Swirl-Assisted Jet-Stabilized Gas Turbine Combustor
Paper Type
Technical Paper Publication