| Co-Investigator(Kenkyū-buntansha) |
KIHARA Hisashi KYUSHU UNIV., DEPT.AERONAUTICS & ASTRONAUTICS,RESEARCH ASSOCIATE, 工学部, 助手 (60243911)
ASO Shigeru KYUSHU UNIV., DEPT.AERONAUTICS & ASTRONAUTICS,ASSOCIATE PROFESSOR, 工学部, 助教授 (40150495)
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| Research Abstract |
The atmospheric entry of space transportation systems at high altitudes generates a very strong shock wave. Such a shock wave causes vibrational excitation, dissociation and ionization of the shock layr gas, and the flow will be in thermal and chemical nonequilibrium due to very low density. Although rotational temperature is quickly equilibrated with translational temperature of heavy particle, vibrational temperature and electron temperature deviate from translational temperature. Therefore, in order to estimate re-entry aerodynamic heating, the following items should be revealed :
(1) Effect of thermal nonequilibrium : energy transfer rates among translational, vibrational and electron-translational energy modes,
(2) Radiative effect : Radiative intensity in high temperature gas behind a strong shock,
(3) Effects of wall conditions : effect of catalytic wall on aerodynamic heating, wall condition for vibrational temperature.
In the present investigations, nonequilibrium flows including the above three conditions are studied experimentally and numerically. In the numerical study of viscous shock layr (VSL) analysis of the thermochemical nonequilibrium flows over a blunt body, a three temperature model was treated and thereby the structure of nonequilibrium shock layr flows was revealed. In addition, the effect of wall catalysis on aerodynamic heating was investigated. Also, experiments were carried out using a piston-driven shock tube, and radiation spectrum emitting from the high-temperature gas behind a strong shock wave was observed. wall vibrational-condition has been deduced from theoretical analysis considering vibrational energy flux at the edge of Knudsen layr.
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