RADIATIVE IONIZATION PATTERNS IN COLD PRECURSOR OF AXISYMMETRIC DETACHED SHOCK,
Abstract
Radiative ionization patterns in the precursor of the shock preceding a blunt body immersed in a hypersonic monatomic gas flow are obtained. Based on earlier work that provides for the uncoupling of the radiative transfer from the gas dynamics, a plausible model of the shock structure and shock layer radiation is proposed. The rate equation for the production of electrons in the precursor is dependent only upon photon absorption because ionizing and neutralizing collisions are negligible; it is solved in the near precursor where one-step radiative ionization dominates. Geometrical complexities introduced by the multidimensional shock are encountered along with the spectral difficulties associated with nonequilibrium radiative ionization. Spatial calculations for the degree of ionization in argon throughout the near precursor are presented for a downstream degree of ionization on the stagnation streamline of 0.8, an upstream temperature of 300K, and an upstream pressure of .001 atm. Intriguing patterns of constant electron density reveal a 'concentric sphericity effect' close to the shock axis of symmetry. In addition, asymptotic solutions illustrate the failure of a radiative point source description of the shock layer to yield accurate solutions illustrate the failure of a radiative point source description of the shock layer to yield accurate solutions off the axis of symmetry. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1969
- Accession Number
- AD0693492
Entities
People
- Anthony N. Pirri
- Joseph H. Clarke
Organizations
- Brown University