By Lieuwen, Timothy C.; Yang, Vigor(eds.)
Larger working efficiencies, fewer pollutant emissions, and coffee capital funding have made gasoline generators a dominant know-how for brand new energy producing potential within the U.S. and around the globe. This ebook bargains fuel turbine clients and brands a worthwhile source to assist them kind via concerns linked to combustion instabilities. within the final ten years, enormous efforts were made within the commercial, governmental, and educational groups to appreciate the original concerns linked to combustion instabilities in low-emission gasoline generators. the target of this e-book is to assemble those effects right into a sequence of chapters that tackle many of the points of the matter. The Case stories part speaks to precise producer and person reports with combustion instabilities within the improvement degree and in fielded turbine engines. The e-book then is going directly to research the basic Mechanisms, The Combustor Modeling, and regulate Approaches.
- facts and knowledge showing during this e-book are for informational reasons in basic terms. AIAA and the writer will not be liable for any harm or harm because of use or reliance, nor do AIAA and the writer warrant that use or reliance might be loose from privately owned rights.
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Extra info for Combustion Instabilities in Gas Turbine Engines - Operational Experience, Fundamental Mechanisms, and Modeling
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. , and Reid, W. , Hydrodynamic Stability, Cambridge Univ. , 1981. , “Instability of a Premix Burner with NonMonotonic Pressure Drop Characteristics,” Journal of Engineering for Gas Turbines and Power, Vol. 125, No. 1, 2003, pp. 20–27. 29 Broda, J. , Santoro, R. , “An Experimental Investigation of Combustion Dynamics of a Lean, Premixed Swirl Injector,” Proceedings of the Combustion Institute, Pittsburgh, PA, Vol.
Senior Principal Combustion Engineer. 29 30 K. O. SMITH AND J. BLUST with it new technological challenges. Perhaps most difﬁcult is the avoidance of high-amplitude, combustor pressure oscillations (CPOs) that can severely damage turbine components. High CPOs occur in LP gas turbines because combustor ﬂame temperatures have been reduced to reduce NOx emissions. At lower ﬂame temperatures, the combustor design point is closer to the lean blowout condition, where ﬂame stability is reduced and small temporal variations in the fuel–air ratio can signiﬁcantly affect the heat release rate.
6). To achieve lower NOx levels, combustion systems that were inherently less prone to CPOs (and therefore less reliant on pilot ﬂames) would be needed. IV. Emissions Reduction to 25 ppmv NOx As development work continued to reduce NOx emissions to the longer-term goal of 25 ppmv, the limitations of using high pilot injector fueling for CPO control were seen. The level of pilot fueling needed to control CPOs with the then-current injector designs resulted in NOx levels that were too high to consistently meet a 25-ppmv guarantee.