Other
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........23p&link_type=abstract
Ph.D. Thesis Stanford Univ., CA.
Other
Atmospheric Composition, Atmospheric Physics, Methane, Planetary Composition, Radiative Heat Transfer, Satellite Atmospheres, Shock Layers, Titan, Aerothermodynamics, Flight Envelopes, Shock Waves
Scientific paper
The presence of methane in the atmosphere of titan leads to substantial radiation and radiative heat transfer in the shock layer of the Huygens probe which will penetrate the Titanian atmosphere in the year of 2003. Study of the hypervelocity aerophysics of Titan entry is challenging due to the presence of methane which affects the gas radiation significantly and provided motivation for the present study. There are two aspects to the present work, one dealing with a numerical analysis, the other with a shock tube experiment to generate an equivalent radiative environment downstream of a shock entering a simulated Titan atmosphere. In this problem, the flow field is strongly influenced by the lack of thermochemical equilibrium. Thus, the chemical rate equations play an important role as does the choice of a fluid model characterized by three temperatures, namely, a heavy particle translational temperature, a vibrational temperature and an electron temperature. The set of governing equations was solved numerically, which gave results for the distribution of the various major species behind the shock. The radiative emission has been calculated by use of these results. The shock tube experiments made use of a simulated Titan atmosphere energized by a shock wave traveling at 5.75 km/sec; the shock was generated by hydrogen-oxygen combustion in the Stanford High Pressure Shock Tube. Numerical and experimental results were compared. An important result of this study is the estimation of the stagnation point heat transfer, which can be used in the design process, allowing for a more rational heat shield design in the regions of the flight envelope where aerothermodynamic nonequilibrium phenomena are likely to occur.
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