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Detection and suppression of lean blowout (LBO) is demonstrated in liquid fueled, non-premixed combustor, based on previous approaches developed for premixed, gas fueled combustors. OH chemiluminescence from the combustion process was used with a threshold based identification of precursor events. Precursor events are short duration local extinction events occurring closer to the blowout limit. These precursors appear random in time, and occur more frequently as the LBO limit is approached. In the combustor studied here, one region of the combustor was found to be less stable, and thus detection there gave greater sensitivity to LBO proximity. To avoid blowout, redistribution of the total fuel inside the combustor between main and pilot nozzles has been used. The idea is to increase the equivalence ratio near the stabilization region of the combustor and provide a locally more stable combustion zone that can anchor the flame in the rest of the combustor. This moves the effective LBO limit to leaner overall mixtures, thus increasing the LBO safety margin. Two nozzles were used for pilot injection and their effectiveness was compared. The atomization and evaporation of the injected pilot fuel may play an important role in the effective stabilization of the combustor near blowout. The sensing method was found to be working even with the piloting. The location of the sensor was found to dictate the type of control scheme used to prevent blowout, using that sensor.
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Journal | Data powered by TypesetCombustion Control |
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Publisher | Data powered by TypesetAmerican Institute of Aeronautics and Astronautics |
ISSN | 0001-1452 |
Impact Factor | 1.868 |
Open Access | No |
Citation Style | unsrt |
Sherpa RoMEO Archiving Policy | Green |