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Abstract-
The level of surface pressure fluctuations near separation and reattachment at
high speeds can be quite large leading to significant aerodynamic excitation on
the structure. While several studies have addressed the problem of surface
pressure fluctuation near separation not much attention has been given to the
reattachment zone. Measurements of mean and unsteady surface pressure
fluctuations in boat-tail separated flows (relevant to launch vehicle
configurations) at transonic speeds have been carried out. Features of mean and
fluctuating pressure field with emphasis on the reattachment zone will be
discussed including aspects of similarity. The effectiveness of a passive flow
control technique involving a porous surface with a cavity beneath, applied
locally in the zone of reattachment, has been assessed: the results show that
peak r.m.s. value of pressure fluctuation near reattachment can be reduced by
about 35% with some reduction in the entire separated zone.
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