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Observations of a sweeping jet actuator for flow separation control of a backward-facing ramp

The three-dimensional flow features produced by a single sweeping jet actuator in a flow separation control application is investigated using stereoscopic PIV. By varying the freestream Reynolds number and actuator's position, noticeable differences in the near-field vortex dynamics, local flow entrainment levels, and geometry of the separation bubble can be observed. Insights into these three-dimensional flow features and its effects on flow separation control are offered which may be useful in further improving the efficiency of these actuators and optimizing their operating conditions.