Nonequilibrium Aerodynamics for a Super-orbital Reentry

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1. Investiation of a noneguilibrium shock layer around a super-orbital reentry capsuleUsing the VSL (Viscous Shock Layer) method, a thermochemical nonequilibrium shock layer around a super-orbital orbital reentry space vehicle was numerically investigated. Heat flux on the vehicle wall was estimated from the computed flow properties. In addition, radiative heat flux was also calculated. It was revealed that the dominant spectra were the line spactra of N, O and N+ in the ultra-violet and vacuum ultra-violet region.2. Ablation coolingThe VSL analysis was extended to a nonequilibrium shock layer with ablation cooling. The vehicle wall temperature for which the ablation cooling warks efficiently was investigated. The spectrum caused by the ablation was C swan band.3. Structure of a very strong shock wave caused by a super-orbital reentryA very strong shock wave was generated by a piston^driven shock tube and electron density was measured behind it using a one-dimensional imaging spectroscopic method developed by one of the invesigators of this research. The results showed that ionization rate was faster than that predicted by the conventional model.