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Extra resources for Aerothermodynamics of Aircraft Engine Components (Pandora Books)
Turbulence Effects Previous discussions of both premixed and diffusion-controlled combustion have concentrated on laminar systems. In practice, however, the presence of turbulence has an extremely important influence on both premixed and diffusion-controlled combustion. The rate of flame propagation in a premixed system is greatly enhanced by turbulence. Most available information on this subject has been developed to improve the understanding of turbulent flame propagation in afterburners. However, turbulent flame propagation information is currently of additional importance, as low-emission combustors employ a highly turbulent fuel-air mixing and vaporization zone prior to combustion (see Chap.
The vehicle performance will be penalized at cruise for the poor off-design point operation of the engine components and for the larger weight of the engine. Similar problems arise when supersonic cruise vehicles are considered. The afterburning gas turbine cycle was an early attempt to avoid some of these problems. Afterburners or augmentation devices were first added to aircraft gas turbine engines to increase their thrust during takeoff or brief periods of acceleration and supersonic flight.
And Stinson, K. , New York, 1952. 2Edelman, R. , "Some Observations on Flows Described by Coupled Mixing and Kinetics," Emissions from Continuous Combustion Systems, edited by W. Comelius and W. Agnew, Plenum Press, New York, 1972, pp. 55-90. 3Howard, J. , Williams, G. , and Fine, D. , 1973, pp. 975-986. 4 Mosier, S. A. , "Low Power Turbopropulsion Combustor Exhaust Emissions," AFAPL-TR-73-36, Vols. 1-3, 1974. SFremont, H. , Powell, H. , and Siecia, S. , Properties of Combustion Gases, Vols. , Cincinnati, 1955.