The influence of the excitation frequency of the cavity changes of synthetic jet actuator to the formation of vortex ring

This research is a basic study of the development of turbulent flow separation controlling the aerodynamic phenomena, especially in the design of the vehicle body. The purpose of this study was to analyze the performance of the synthetic jet (SJA) as one of the tools in reducing the flow controller separation area on the bluff body model of the vehicle. To get the maximum results of the performance of the synthetic jet actuator, the research starts with the actuator characterize. Its characteristics include changes in shape of the cavity and orifice diameter. Its cavity forms, namely half balls, tubes and conical, while its orifice diameter is 3, 5 and 8 mm. The study was conducted using computational and experimental approaches. Both types of research methods was compared and displayed the results in graphical form. This result is a reference in determining future research. The experimental results in the form of the flow rate for each type of cavity can determine the formation of vortex ring, whereas in CFD simulations, the formation of vortex ring can be seen from the visualization of the flow contour. Vortex ring cavity can occur at B3, T3, T5, K3 and K5. Vortex ring is not formed on any type of cavity with a diameter of 8 mm orifice.