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A STUDY OF HYPERSONIC AERODYNAMIC DRAG DEVICES
CORNELL AERONAUTICAL LAB INC BUFFALO NY
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A two-phase study of hypersonic zero-lift drag devices which could be used to recover space vehicles re-entering the earths atmosphere has been made. The results of the first theoretical phase, which are summarized in an interim report AD-317 490, indicate that variable area drag devices produce less heating and deceleration than a fixed-area device of the same maximum size. Also, for a fixed-drag device, minimum peak decelerations occur with CDAW of 0.10. In this second test phase, various drag device models were tested at hypersonic speeds. Good agreement was found in heating and drag on simple shapes. Heat distributions and drags were determined for a number of complex shapes and some parametric relationships were established. Criteria for selecting an optimum device were also established. Author
APPROVED FOR PUBLIC RELEASE