Accession Number:

ADA214621

Title:

Combustion of Hydrogen and Hydrocarbons in Fluorine

Descriptive Note:

Final rept. 1 Aug 1984-31 Jul 1989

Corporate Author:

EMORY UNIV ATLANTA GA DEPT OF BIOLOGY

Personal Author(s):

Report Date:

1989-09-05

Pagination or Media Count:

48.0

Abstract:

Our program is directed towards increasing understanding of combustion processes in general, as well as advancing the application of fluorine-supported combustion in areas such as propulsion and chemical lasers. Since fluorine is monovalent, combustion in fluorine is chemically much simpler than combustion in oxygen. However, in fluorine-based combustion most of the energy is initially deposited into vibration of HF, and transfer of energy from vibrationally excited species must be considered. Experiments in H2-F2 flames to which very small amounts of Methane have been added are particularly revealing and indicate that the most likely mechanism for explaining luminescence from CH and CHF radicals in these flames is vibration-to-electronic energy transfer from highly vibrationally excited HF. C2 emission probably results from the CH CH yields C2 H2 reaction. These conclusions suggest that the ratio ICHICH212 is a useful diagnostic for vibrationally excited HF in H2-F2 propulsion and laser systems. Ionization is not intrinsic to fluorine-hydrocarbon combustion, but often results from oxygen impurity in fluorine. Fluorine combustion systems show a variety of nonsteady behaviors, which are postulated to be due to changes in concentrations of vibrationally excited species in the system. The method of kinetic titrations has been developed to obtain stoichiometric, kinetic and mechanistic information about chemical reactions.

Subject Categories:

  • Industrial Chemistry and Chemical Processing
  • Physical Chemistry
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE