Combustion Control by Additional Fluid Injection for Premixed Gas Turbine Combustor

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This paper deals with the effect of secondary fluid injection on oscillatory combustion of a turbulent premixed flame. The effect of injection angle and fluid type on pressure fluctuations and NOx emissions was investigated. Characteristics of pressure fluctuations, NOx emissions and flame shapes （OH* chemiluminescence image and OH-PLIF measurement） were discussed. The results indicated that air-injection inclined at 45 degrees from streamwise direction was effective to stabilize the oscillatory flame. However, NOx emissions were slightly increased. Furthermore, it was found that secondary injection inclined at 90 degrees showed good performance to reduce NOx emissions successfully.

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