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Abstract
Experiments have been made to assess the effectiveness of passive devices for reducing base and total afterbody drag at Mach 2. The devices examined include primarily base cavities and ventilated cavities. Results show that ventilated cavities offer significant base-drag reduction and net-drag reduction of engineering value. A correlation of base- and net-drag reduction for ventilated cavities has been suggested. Typical effects of these devices on boat-tailed and flared bases have also been assessed. ^DB -pb D h L M #00 t Nomenclature = forebody (max) cross-sectional area, 490.625 mm2 = total area of ventilation = total afterbody drag coefficient, net-drag force/to^ A) = base-drag coefficient = base-pressure coefficient = forebody (max) diam, 25 mm = cavity depth = afterbody length = freestream Mach number = freestream dynamic pressure = cavity lip thickness
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