Standing Shock Formation in a Non-reflected Shock Tube
The study of thermo-chemical relaxation processes in shock tubes requires flow with sufficient residence time to allow the relaxation process to complete. In the context of hypersonic reentry, the length scales of interest are determined by the size of the flight vehicles, which in general are too large to be reproduced in the laboratory. For non-equilibrium binary kinetic processes, density-length scaling (where the product of density with a characteristic length scale is conserved) may be used to reproduce flight conditions. However, for situations where equilibrium is reached, any change to the overall pressure level will change the chemical composition, and similarity with flight will not occur, Morgan . Therefore to study the radiation from regions of equilibriumflow, test gas at the same pressure as exists in flight must be used. Because the conditions at equilibrium are not path dependent, provided the appropriate pressure and temperature are reached, it is possible to study the radiation from an equilibrium region by creating just a small section of the flow field.
KeywordsTest Section Shock Tube Incident Shock Shock Layer Blunt Body
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