Abstract
The effect of modulated air jets, introduced through the combustor shell, on the temperature distribution and nitric oxide emissions is investigated. Temperature and emissions measurements have been made at a number of forcing frequencies in the range of 100-850Hz, blowing ratios in the range of 4-10 and equivalence ratios between 0.6 and 1.0. Open-loop flame response to forcing has also been acquired by recording pressure spectra. Results show that substantial reductions in nitric oxide emissions index (15-30%) can be obtained over a wide range of flow conditions with side-air jet forcing. In addition, forcing also alters the time averaged temperature field, with higher mean temperatures close to the dump plane, due to enhanced fuel-air mixing. The higher temperatures and volumetric heat release obtained with forcing can enable more compact combustor designs. The lower emissions are potentially linked to greater unsteadiness with forcing.
Original language | English |
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Pages (from-to) | 2255-2278 |
Number of pages | 24 |
Journal | Combustion Science and Technology |
Volume | 179 |
Issue number | 11 |
DOIs | |
Publication status | Published - Nov 2007 |
Externally published | Yes |
Keywords
- Emissions
- Forced jet
- Mixing
- Spray combustion