This study investigated the use of a coaxial dielectric barrier discharge plasma actuator (DBD-PA) at a nozzle exit for jet diffusion control. In order to achieve enhanced mixing of the primary jet flow, the influence of the input voltage and frequency to the plasma actuator was examined. In the case of continuous operating, the secondary flow by the induced flow using coaxial plasma actuator is able to adjust the velocity gradient of the free shear layer near the jet nozzle. Intermittent control using the plasma actuator was also attempted by varying the intermittency frequency and the duty ratio. Based on the results of a PIV analysis, the optimum conditions for jet diffusion control were found to be an intermittency frequency that matched the preferred frequency and a duty ratio at 50%.

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