Numerical study of synthetic jets with dual circular orifices

Flow control is an important issue in the performance of aircrafts. In recent years, synthetic jet actuators have shown potential benefits in flow control. This has resulted in several investigations on various aspects of synthetic jet actuators to achieve higher momentum delivering capability. To this end some flow visualisation studies have been conducted to investigate the effect of using dual circular orifices instead of a single one. The studies have shown that when fluid passes through two smaller orifices, the resulting total circulation of the fluid appears to be greater than it is when the same fluid passes through a single but larger orifice. In this numerical investigation the flow structure of synthetic jets with one orifice and two orifices were examined and compared. The results are encouraging and suggests that circulation can be increased by creating coherent vortex rings effectively using dual orifices and thereby achieve a desired circulation.