Accession Number : AD0778664

Title :   Mixing and Combustion Processes in Air Breathing Propulsion Systems.

Descriptive Note : Final technical rept. 1 Mar 70-28 Feb 74,


Personal Author(s) : Smoot,L. Douglas

Report Date : 01 MAY 1974

Pagination or Media Count : 165

Abstract : The general objectives of this study were to provide predictive techniques for air-breathing, particle-laden combustors and experimental data on rates of combustion and/or mixing of particle-laden jets. Jet mixing model predictions were compared with experiments reported in the literature. This led to the development of a turbulent mixing coefficient that improved predictions for systems with nonzero secondary velocity and gave reasonable predictions for reacting jets. The mixing model was extended to include boron particle nonequilibrium effects. Several predictions with this uncoupled model are also shown. A fully coupled turbulent jet mixing model was developed for a nonreacting, particle-gas system. Tests were made using a laboratory air-augmented combustor and a boron-loaded fuel. Mixing rates of particles and of gases were measured, as was extent of combustion of the boron particles. Tests were made using a new jet test facility for measuring mixing rates of particle-laden, nonreacting jets. Mixing rates of particles and gases were separately measured. Particle size, jet density and air velocity were systematically varied. (Modified author abstract)

Descriptors :   *Jet mixing flow, *Turbulent diffusion, *Combustion chambers, Particle size, Gases, Particles, Air breathing, Rates, Combustion, Density, Boron, Fuels, Coupling(Interaction), Air flow, Mathematical models, Experimental data, Velocity, Gas flow

Subject Categories : Physical Chemistry
      Fluid Mechanics
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE