Abstract
A flow study of a sphere, 80mm diameter designed with localized synthetic jet orifices, was conducted using a five-hole pressure probe. The airflow was generated in an 18” x 18” open circuit wind tunnel that was operated at a Reynolds Number of 5x10 corresponding to an airspeed of 10ms. Wake surveys were conducted using the five-hole pressure probe for the standard sphere, that is with no application of the synthetic jet, and subsequently three different angles of incidence of the localized asymmetrical synthetic jet. The wake survey data were presented in three-dimensional vector field plots which showed the synthetic jet increased the streamwise velocity component and decreased the size of the wake when compared to the standard sphere. Vorticity contour plots showed that the effect of the synthetic jet was to dispersed vorticity and streamline the flow. Flow visualization using tufts also provided further evidence of streamlining and wake reduction of the flow. This would indicate a reduction in the standard sphere drag coefficient when synthetic jet was applied.
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