Abstract
The turbulent structures in the highly compressible near-wake region of a cylindrical base, to which an axisymmetric sub-boundary-layer strip disturbance has been applied, are examined in detail using a planar Rayleigh/Mie scattering visualization technique. When the downstream edge of the axisymmetric disturbance is placed approximately 12 momentum thicknesses upstream of the base termination, a base pressure increase of approximately 3% is noted over the no-tab case. The increased base pressure due to the presence of the axisymmetric disturbance is attributed to the transfer of turbulent energy into instability modes that are not supported in the near-wake region
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