Accession Number:

ADA229591

Title:

Initiation and Modification of Reaction by Energy Addition: Kinetic and Transport Phenomena

Descriptive Note:

Final rept. 1 Sep 1988-1 Sep 1990,

Corporate Author:

TRW SPACE AND TECHNOLOGY GROUP REDONDO BEACH CA

Report Date:

1990-10-01

Pagination or Media Count:

149.0

Abstract:

Laboratory experiments, supplemented by approximate theoretical studies, have been carried out on the photochemical ignition of a flowing homogeneous gaseous fuel-oxidizer premixture by nonintrusive energy addition. In the experimental task, we have successfully demonstrated the ignition of H2O2 and CH4O2 mixtures with photolysis of NH3 by use of an ArF laser at 193 nm. The theory, by a combination of numerical and approximate analytic methods, examines the interaction of premixture stoichiometry, preferential diffusion i.e., differing diffusivities for heat and species, and flame radius, with respect to the outward propagation of a laminar flame from a single spheroidal kernel if a flame develops. Previously reported observations of the variation of the flame- front speed with flame radius, sometimes interpreted in terms of preferential- diffusion effects but probably better interpreted in terms of radiative heat loss, have been examined the need exists for further spherical-flame- propagation experiments, with emphasis on measurements taken when the flame radius is more nearly comparable to the flame thickness. ttl

Subject Categories:

  • Radiation and Nuclear Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE