Accession Number : ADA299347

Title :   Theories of Turbulent Combustion in High Speed Flows.

Descriptive Note : Final technical rept.,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA

Personal Author(s) : Libby, P. A. ; Williams, F. A.

PDF Url : ADA299347

Report Date : 13 JUN 1995

Pagination or Media Count : 11

Abstract : This research involved 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 addressed ignition and extinction phenomena in nonpremixed turbulent combustion of hydrogen-air systems by both numerical and asymptotic methods. Efforts were 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. It was shown that turbulent combustion occurs in the reaction-sheet regime in hypersonic propulsion, and the correspondingly needed critical ignition and extinction conditions for hydrogen-air systems were determined from fundamentals.

Descriptors :   *TURBULENCE, *SUPERSONIC COMBUSTION, EXTINCTION, METHODOLOGY, RATIOS, MODELS, AIR, CHEMICALS, HIGH VELOCITY, THEORY, HYDROGEN, PROPULSION SYSTEMS, LOW VELOCITY, ASYMPTOTIC SERIES, IGNITION, FLOW, KINETICS, NUMERICAL METHODS AND PROCEDURES, FLUID DYNAMICS, HYPERSONIC VEHICLES.

Subject Categories : Fluid Mechanics
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE