Download Combustion Instabilities in Gas Turbine Engines (Progress in by T. Lieuwen, V. Yang PDF

By T. Lieuwen, V. Yang

Larger working efficiencies, fewer pollutant emissions, and coffee capital funding have made fuel generators a dominant know-how for a brand new strength producing potential within the US and around the world. This ebook deals fuel turbine clients and brands a source to aid them variety via matters linked to combustion instabilities.

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Extra resources for Combustion Instabilities in Gas Turbine Engines (Progress in Astronautics and Aeronautics)

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Measurements of Incoherent Acoustic Wave Scattering from Turbulent Premixed Flames,” Proceedings of the Combustion Institute, Pittsburgh, PA, Vol. 29, 2002. , “Experimental Investigation of Limit Cycle Oscillations in an Unstable Gas Turbine Combustor,” Journal of Propulsion and Power, Vol. 18, No. 1, 2002, pp. 61–67. 26 Oefelein, J. , “Comprehensive Review of Liquid-Propellant Combustion Instabilities in F-1Engines,” Journal of Propulsion and Power, Vol. 9, 1993, pp. 657– 677. 27 Drazin, P.

High amplitude CPOs occur when the pressure and heat release are phased to peak simultaneously. Simplistically, in the SoLoNOx injector, the heat-release fluctuation frequency can be tied to the time τ required for the fuel to travel from the fuel spoke to the injector exit (or more accurately to the flame front). Thus, according to this model, CPOs (of frequency f C ) are less likely to occur if the fuel transit time does not align with a resonant acoustic frequency of the combustor (τ = 1/[2 f C ]).

28,29 These changes, in turn, can have an impact on the static pressure distribution in the combustor because it depends on the distribution of the combustion-process heat release. C. Causes of Nonlinearities Numerous processes that drive and damp oscillations in unstable combustors depend nonlinearly on the instability amplitude. These nonlinearities may be caused 22 B. T. ZINN AND T. C. LIEUWEN by flow and combustion processes that occur either within the combustor volume or at its boundaries.

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