STUDY OF INFRARED EMISSION FROM HYPERSONIC AIR FLOWS
Abstract
Research is being conducted to formulate a comprehensive picture of the IR radiation from reentry bodies. The program is divided into: (1) the experimental determination of the radiative properties of the optically active gaseous species, and (2) the analysis of the blunt-body flow field, in which the finite-rate chemistry of the air is coupled with the aerodynamics of the flow. The final analysis of the nitrogen first-positive band spectrum has been completed. The measured intensities are lower by a factor of 5 than those reported for measurements in shock-heated air. The nonequilibrium radiation from this N2(1+) system, arising from the finite rate of electronic excitation has been studied. A machine program generated the spectra of radiating species from the known spectroscopic constants and the experimentally determined transition probabilities. Several re-entry flow calculations were completed, and a nonequilibrium scaling criterion investigated. Computations are discussed and the scaling criterion is valid for the IRBM (15,000 fps) and ICBM (23,000 fps) conditions.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1962
- Accession Number
- AD0273865
Entities
People
- Paul V. Marrone
- Walter H. Wurster
Organizations
- Calspan