Abstract
The induced flow field in the vicinity of a single, symmetric, AC plasma actuator has been studied in initially static air at atmospheric pressure. Hot-wire and cold-wire anemometry, together with flow visualization, were used to observe the temporal and spatial structure of the induced flow. The plasma discharge is pulsed on a millisecond scale and the flow forms a series of pulsed wall jets, which can be maintained indefinitely, similar to a synthetic jet. It was observed that the plasma actuator initiates a pair of vortices at the instant of plasma creation, moving at 25° to the surface. After an initiation period, the plasma develops into a laminar wall jet. Thermal imagery has been used to estimate the surface temperature of the dielectric sheet during plasma operation.
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