Abstract
Schlieren techniques have been used in a free-flight range study of the far wake of hypersonic cones. The distance required for viscous wake turbulence to break through the inviscid wake was measured for a variety of cone bluntness ratios, and these were compared with previous measurements using hypersonic spheres. At low Reynolds numbers, the breakthrough distances were found to be much more sensitive to changes in Reynolds number for the bluntest bodies than for those with the least bluntness. This difference was attributed to the effects of viscous wake damping by the action of viscosity, effects that should be more pronounced for blunt bodies. The width of the far wake approached the classical one-third power-law variation with distance and with body-drag coefficient soon after breakthrough.
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