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Theories of Turbulent Combustion in High Speed Flows
Annual rept. Apr 1993-Apr 1994
CALIFORNIA UNIV SAN DIEGO LA JOLLA
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This research involves theoretical studies of the chemical and fluid- mechanical phenomena which make turbulent combustion in high-speed flows different from such combustion in low-speed flows. Finite-rate chemistry plays a significant role in high-speed flows because of the small ratios of flow times to chemical times. The studies address ignition and extinction phenomena in nonpremixed turbulent combustion of hydrogen-air systems by both numerical and asymptotic methods. Attention also is paid to effects of compressibility in high-speed turbulent combustion, with consideration given to interdispersal configurations of shocklets and flamelets. Efforts are made to provide a firmer foundation for the modeling of high-speed turbulent reacting flows, to aid in the development of a formulation which gives results that can be compared with experiments on turbulent combustion.
APPROVED FOR PUBLIC RELEASE