SIMILARITY LAWS REQUIRED FOR EXPERIMENTAL AERO-THERMOELASTIC STUDIES. PART 2 HYPERSONIC SPEEDS
MASSACHUSETTS INST OF TECH CAMBRIDGE AEROELASTIC AND STRUCTURES RESEARCH LAB
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The parameters associated with the external pressure and heat flux imposed on the structure, the heat transfer distribution within the structure for both ablating and non-ablating materials and the stress-deflection behavior under short-time and long-time loading conditions are considered. The structural parameters associated with nonlinear material properties at high temperatures, plasticity, creep and fatigue are treated. Similitude for the general aerothermoelastic problem is possible only for a scale ratio of one and for a thermal and pressure environment identical with the prototype. The basic conflict arises when mutually satisfying the requirements of same temperature, Reynolds number, surface radiation parameter and the aeroelastic parameter. Means of dealing with this conflict are suggested. These include looking at more specialized situations peculiar to both blunt bodies and affinely related slender bodies in continuum and free molecule flow, the use of incomplete aerothermoelastic testing, in which pressure and thermal loadings are estimated in advance and applied artificially to the model, and the use of restricted- purpose tests investigating a particular facet of the complete aerothermoelastic problem. Available types of test facilities appropriate for these investigations are surveyed.
- Fluid Mechanics