Accession Number:

AD0729934

Title:

Combustion Kinetics of Reentry Vehicle Ablation Materials.

Descriptive Note:

Annual summary rept. (Final), 1 Jul 70-30 Jun 71,

Corporate Author:

DREXEL UNIV PHILADELPHIA PA COMBUSTION KINETICS LAB

Personal Author(s):

Report Date:

1971-07-01

Pagination or Media Count:

63.0

Abstract:

The thermal decomposition of carbonyl fluoride COF2 in excess argon was studied behind shock waves in the temperature and total pressure ranges 2600-3600K and 0.5 to 12 atmospheres respectively. The reaction was found to be unimolecular in nature, and the observed rate constant variation with temperature and total pressure was analyzed with the aid of both Lindemann and RRK unimolecular reaction rate theories. The experimentally determined activation energy for the high pressure limiting rate constant was shown to be slightly in excess of the first bond dissociation energy of COF2, and the Lindemann theory was shown to best fit the experimental data. Preliminary shock tube studies of the thermal decomposition of COF2 in the presence of molecular hydrogen have been carried out in the temperature and pressure ranges 2700-3300K and 1.9 to 3.0 respectively. The temperature dependence of the spectral and integrated intensity of the 1943cm infrared band of carbonyl fluoride was experimentally determined in the temperature range 300-600K. An expression for the temperature dependence of the theoretical band shape of the v2 fundamental vibration of COF2 was developed. The Fermi resonance effects were combined with the theoretical band shape to predict the spectral intensity of the 1943cm band at temperatures above 600K. Author

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy
  • Combustion and Ignition

Distribution Statement:

APPROVED FOR PUBLIC RELEASE