This paper presents the progress made on the development of a dual spray, direct injection airblast fuel nozzle capable of variable fuel placement. It is anticipated that by varying the fuel placement within the confines of a combustion chamber it will be possible to control localised zonal ‘Fuel Air Ratio’ and thus extend both stability and emissions performance in respect of engine power range. The extension of combustion stability is particularly desirable to high pressure, temperature and turndown ratio aero engines where the ratio between maximum and flight idle fuel flow is extreme. Target performance data for the design has been derived from anticipated future engine cycles. A number of initial concepts were examined and recent development work has focused on the most successful design to date. Combustor testing has been performed at both atmospheric and high pressure. The combustor utilised was a single sector tubular combustor with combustor volume and airflow distributions representative of the cycle for which the fuel injector was designed. Two fuel injector configurations were examined, having different design flow structures. Combustion stability testing was performed with air inlet conditions of atmospheric pressure and 293K. Stability and ignition data were derived over a range of combustor pressure drops. Fuel injector AFRs of over 100:1 were achieved. An ignition loop was also derived although optimisation studies were not performed at this stage. High pressure emissions evaluation was also performed up to 13 Bar. Idle and scaled climb-out power conditions were tested, with a range of fuel scheduling between the pilot and main. Idle efficiency of over 99.5% was achieved. Low emissions performance was also achieved with less than 10 EINOx at climb out power settings. Future work will include testing at up to 40 Bar pressure to establish actual full power performance in addition to further development work on stability and ignition performance.
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ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference
June 16–19, 2003
Atlanta, Georgia, USA
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
0-7918-3685-1
PROCEEDINGS PAPER
Variable Fuel Placement Injector Development
K. D. Brundish,
K. D. Brundish
QinetiQ, Farnborough, Hampshire, UK
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M. N. Miller,
M. N. Miller
QinetiQ, Farnborough, Hampshire, UK
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L. C. Morgan,
L. C. Morgan
Aero & Industrial Tehchnology, Ltd., Burnley, Lancashire, UK
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A. J. Wheatley
A. J. Wheatley
Aero & Industrial Tehchnology, Ltd., Burnley, Lancashire, UK
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K. D. Brundish
QinetiQ, Farnborough, Hampshire, UK
M. N. Miller
QinetiQ, Farnborough, Hampshire, UK
L. C. Morgan
Aero & Industrial Tehchnology, Ltd., Burnley, Lancashire, UK
A. J. Wheatley
Aero & Industrial Tehchnology, Ltd., Burnley, Lancashire, UK
Paper No:
GT2003-38417, pp. 339-346; 8 pages
Published Online:
February 4, 2009
Citation
Brundish, KD, Miller, MN, Morgan, LC, & Wheatley, AJ. "Variable Fuel Placement Injector Development." Proceedings of the ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. Volume 2: Turbo Expo 2003. Atlanta, Georgia, USA. June 16–19, 2003. pp. 339-346. ASME. https://doi.org/10.1115/GT2003-38417
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