Abstract
The validity of dielectric-barrier-discharge plasma actuators as spread controller of turbulent free jet issuing from rectangular exit was investigated. Rectangle nozzle of 75mm×10mm (Aspect ratio 7.5) was used and two plasma actuators were placed at the long side of the nozzle exit. The jet velocity at the nozzle was set at 5 m/s and the velocity in the downstream section was measured by a hot wire probe. When actuators were operated with the condition that Duty was 10% and the modulation frequency was 1/8 of the characteristic one and in opposite phase, the jet spread remarkably in xy-plane. On the other hand, when Duty was 30% and modulation frequency was 700 Hz, vortex appeared at closer position to the nozzle exit and it broke down in a short while without growing up, and the spread of the jet in xy-plane was delayed.
