Theoretical Considerations for the Measurement of Radiation from Shock Heated Air
Abstract
Application of hypersonic computational fluid dynamics models for the characterizations and prediction of shock heated air-induced UV radiation from boost phase vehicles is examined. Specifically, velocities of 3-4 km/sec and altitudes of 40-80 km have been considered. Important modeling aspects, such as chemical kinetics, electronic excitation/de-excitation mechanisms, and the existence of equilibrium versus nonequilibrium conditions in the flow are examined. Comparison of theoretical flowfield predictions with recent shock tube data, for the purposes of flowfield code validation, is also shown. Flowfield properties, and in-band radiance values in the 2500A wavelength region, in the vicinity of the stagnation stream line, are presented for a three inch hemisphere. These results were generated to provide input for instrument designers involved in an upcoming rocket experiment to measure UV radiation produced in bowshock.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1991
- Accession Number
- ADA246153
Entities
People
- Deborah A. Levin
- Richard T. Loda
Organizations
- Institute for Defense Analyses