MERGED LAYER IONIZATION IN THE STAGNATION REGION OF A BLUNT BODY.
Technical rept. Aug 65-Apr 67,
AEROSPACE CORP SAN BERNARDINO CALIF SAN BERNARDINO OPERATIONS
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Nonequilibrium air dissociation and ionization in the stagnation region of a blunt body are investigated in the merged layer regime. A chemical system of seven species undergoing six simultaneous reactions is considered. The species conservation equations are decoupled from the simplified Navier-Stokes equations for a thin layer model. However, the complex chemical system is allowed to experience the entire merged layer flow environment in a continuous manner from the shock transition region to the viscous shock layer. Solutions are presented for a catalytic blunt body flying at 23,000 fps and at Re 814 and 1230. The results show that viscous effects dominate the entire merged layer and that the air dissociation and ionization are mainly confined to the viscous shock layer with negligible reaction rates in the shock transition region. Comparisons with nonequilibrium inviscid solutions indicate that the inviscid theory overestimates the peak electron density by as much as two orders of magnitude at the lowest Reynolds number considered. This difference between the merged layer solution and the inviscid solution is attributed to a combination of wall cooling and diffusion of atoms and electrons away from the shock layer. Author
- Physical Chemistry
- Fluid Mechanics
- Plasma Physics and Magnetohydrodynamics