Final Results of On-Line Mass Spectrometric Analysis of Nonequilibrium Airflows
Abstract
Comprehensive determinations of nonequilibrium airflow compositions were made in frozen expansions of arc-heated air in a low-density wind tunnel nozzle. Reservoir conditions included pressures of from 3.7 to 20.8 atm and temperatures of from 2120 to 5380K. The experimentally determined compositions were correlated with the reservoir entropy. At low entropy, the concentrations of molecular species were generally in close agreement with predictions based on finite rate expansion calculations, but at high entropy, where nonequilibrium effects are large, considerable deviations from the predictions were observed. The molecular oxygen content was determined to be 7 percent greater than expected. The atomic oxygen concentration was determined to be consistently less than the theoretical prediction for all values of entropy, by as much as 9 percent of the total sample in the worst case.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1971
- Accession Number
- AD0718955
Entities
People
- R. E. Dix
- W. N. Macdermott
Organizations
- Arnold Engineering Development Complex