Combustion Dynamics and NOx Emission of a Turbulent Swirl Stabilized Combustor with Secondary Fuel Injection :

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To study the effects of flow rate, diameter and offset of secondary fuel injection on combustor noise level, pressure fluctuation and NOx emission, three types of injectors were examined in the swirl-stabilized combustor for total flow rate of 300(l/m) and total equivalence ratio of 0.7～0.9. Secondary fuel injection of 3.0(l/m) is the best condition for the reduction of pressure fluctuation and combustion noise with tolerable NOx emission for the reference injector used in the previous studies. As for the injector with injection offset, although Q_<sec>=4.2(l/m) is more relevant for the reduction of NOx emission and pressure fluctuation for φ≥0.85, noise level and pressure fluctuation are still larger than the reference injector. In addition, spectral analysis of pressure fluctuations revealed that the large amount of secondary fuel injection with offset induces a lot of new modes in broad range of frequency.

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