Spectral Emission and Absorption Coefficients and Nonequilibrium Thickness of Reflected Shock Waves in Air.
Abstract
Hypersonic vehicle design involves estimates of radiation heat transfer from equilibrium and nonequilibrium regions of gases behind strong shock waves. This investigation experimentally measured spectral emission and absorption coefficients and nonequilibrium thickness of strong reflected shock waves in air. Theoretical equations for spectral intensity as a function of spectral emission, absorption coefficients, and radiation thickness were developed. The theory provides significant new information on interpretation of the data. Spectral emission and absorption coefficients of equilibrium air were determined from spectral intensities by using the theory of least squares. Nonequilibrium thickness was obtained by a special iteration technique. Acceleration of the reflected shock wave was included in the data reduction. The results are compared to the data of other investigators. The method developed for determining spectral emission and absorption coefficients is an improvement over previous methods. The overall relaxation time of reflected shock waves in air is greater than the chemical relaxation time. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1970
- Accession Number
- AD0866611
Entities
People
- Leroy Edward Wilson
- Victor J. Skoglund
Organizations
- University of New Mexico