Accession Number : ADA186141

Title :   Chemical Reactions in Turbulent Mixing Flows.

Descriptive Note : Annual rept. Apr 86-Apr 87,

Corporate Author : CALIFORNIA INST OF TECH PASADENA GRADUATE AERONAUTICAL LABS

Personal Author(s) : Dimotakis, P E ; Broadwell, J E ; Leonard, A

PDF Url : ADA186141

Report Date : 01 Jun 1987

Pagination or Media Count : 23

Abstract : Work continues primarily in gas phase turbulent mixing amd chemical reactions with extensions to compressible (supersonic) shear layers. In the gas phase shear layer work, investigations concentrate on subsonic shear layer free stream density ratio effects, and a design effort in support of the planned extension of the hydrogen-fluorine shear flow facility to supersonic flows. In jet flows, measurements of gas phase jet mixing, using laser Rayleigh scattering techniques developed for conserved scalar measurements down to diffusion space and time scales, are in progress. A first publication has just appeared on an experiment in which digital imaging of soot in turbulent flames was used to describe combustion flame sheets in methane flames. Analytical/computational modeling efforts included development of quantitative description of turbulent jet mixing and chemical reactions including finite Damkoehler number effects; supersonic shear layer combustion studies of finite kinetic rate (Damkoehler number) effects for H2/F2/NO and H2/air systems; a new analytical model for turbulent shear layer mixing and chemical reactions; and extensions of hydrodynamic stability calculations to include Mach number effects in supersonic shear layers.

Descriptors :   *CHEMICAL REACTIONS, *MIXING, *TURBULENT FLOW, *VAPOR PHASES, COMBUSTION, COMPUTATIONS, DIGITAL SYSTEMS, FLAMES, HYDRODYNAMICS, IMAGES, JET FLOW, JET MIXING FLOW, LASERS, LAYERS, LIGHT SCATTERING, MACH NUMBER, MATHEMATICAL MODELS, MEASUREMENT, METHANE, RATIOS, RAYLEIGH SCATTERING, REACTION KINETICS, SCALAR FUNCTIONS, SCALE, SHEAR PROPERTIES, SHEETS, SOOT, STABILITY, SUPERSONIC CHARACTERISTICS, SUPERSONIC FLOW, TIME, TURBULENCE

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE