Abstract
The manipulation of a turbulent boundary layer during unstart is demonstrated at Mach 4.7 flow conditions using a dielectric barrier discharge (DBD) actuator. Rayleigh scattering from condensed CO2 particles is used to visualize flow features such as boundary layers and shock waves at low freestream static pressure (1kPa) and temperature (60K). Boundary layer thinning is observed when the activated low power (6.8W), low frequency (28kHz) single actuator pair is oriented parallel to the freestream flow. The control of the unstart process, initiated by mass addition to the supersonic flow, is demonstrated through actuation of these boundary layers. The actuation is more effective when relatively thick boundary layers are actuated.
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