By T. Lieuwen, V. Yang
Greater working efficiencies, fewer pollutant emissions, and coffee capital funding have made gasoline generators a dominant know-how for a brand new energy producing ability within the US and world wide. This e-book deals gasoline turbine clients and brands a source to assist them variety via concerns linked to combustion instabilities.
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Extra resources for Combustion Instabilities in Gas Turbine Engines (Progress in Astronautics and Aeronautics)
To reduce the risk of uncontrollable combustion-acoustic behavior, detection and abatement of combustion–acoustic susceptibility is required in the early stages of a design. A comprehensive strategy to predict, avoid, and/or improve the combustion-acoustic performance of a combustion system includes both analytical and experimental determination of system and component properties and interactions. The basic framework of such a strategy is shown in Fig. 1. In brief, a semianalytical model is used to link the acoustic characteristics of the subcomponent parts of the combustion system and boundaries.
Comb Zone Fig. 7 Can combustor with refractory plug to simulate a Helmholtz resonator. COMBUSTION INSTABILITIES IN INDUSTRIAL GAS TURBINES 37 Clearly the single-injector rig was unable to duplicate the acoustic characteristics of the annular combustor, in which circumferential and mixed-mode oscillations could appear. The rig proved valuable as a screening tool, however. Injectors that tended to drive oscillations in the rig environment almost always showed similar tendencies in an engine. Injectors that operated without high CPOs in the singleinjector rig were frequently stable in the engine, although this was not universally the case.
As such, instability-amplitude prediction capabilities remain a key challenge for future work. References 1 Rayleigh, J. S. , The Theory of Sound, Vol. 2, Dover, New York, 1945. , “Airframe Noise,” Aeroacoustics of Flight Vehicles, edited by H. H. Hubbard, Acoustical Society of America, New York, 1995. , “Low-Frequency Pressure Oscillations in a Model Ramjet Combustor,” Journal of Fluid Mechanics, Vol. 232, 1991, pp. 47–72. , “Acoustic Disturbance from Gas Non-uniformity Convected Through a Nozzle,” Journal of Sound Vibrations, Vol.
Combustion Instabilities in Gas Turbine Engines (Progress in Astronautics and Aeronautics) by T. Lieuwen, V. Yang