Abstract
Stabilization of oscillatory flames caused by strong pressure and hest release fluctuations has been investigated for a methane/air mixture, and effects of secondary injection system on suppressing pressure and heat release fluctuations have been discussed.Furthermore, characteristics of the NOx emissions have been also discussed. Especially, in this study, outer secondary injection nozzle array which is arranged around a swirl-type flame holder is provided to stabilize the oscillatory flame. Methane, hydrogen and air are used for a working mixture of the secondary, respectively. Results show that with appreciate flow rate condition of the secondary injection ; (1) the oscillatory flame is stabilized with the outer secondary jets, where the configuration of secondary nozzle array is optimized, (2) the outer secondary injection has a performance to reduce the pressure fluctuation despite the kind of injected gas as the secondary, and (3) air injection as the secondary is more effective to suppress the pressure oscillation and NOx emissions due to the momentum effect.
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