Abstract
The aim of this study is to investigate on frequency shift of vortex shedding from a circular cylinder by introducing jet with dielectric barrier discharge (DBD) plasma. The electrode of DBD plasma was mounted on the circular cylinder. A constant AC wave with voltage of 2 kV and frequency of 10 kHz is applied to the electrode. The forward and backward jets to the main flow direction were induced by electrode arrangements. The timeaveraged velocity profiles and the vortex shedding frequency in the wake behind the circular cylinder were measured by I-type hot-wire anemometer at a Reynolds number of 1.0×10 3 . We discussed on the wake using the forward jets and backward jets by Hot-Wire anemometer and flow visualization. The vortex shedding frequencies are changed by the forward jet and backward jet of the plasma actuators. From the flow visualization, the frequency shift of vortex shedding is closely related to a length scale of the vortex induced by the forward and backward jet.
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