Numerical simulation of separated flow control on an airfoil using dual synthetic jets

As the last word of the synthetic jet technology, dual synthetic jets have the characteristics of more energetic and more stable. Numerical computations are performed to study the different effect of single synthetic jet and dual synthetic jets on the airfoil's separate flow. The results indicate that when the synthetic jet working, the angle of attack stall can increase by 2° and the maximum lift coefficient can increase by 18%, while the dual synthetic jets result in a increase by 4° and 35% separately. Therefore the dual synthetic jets have better performance on separate flow control. Parameter study is conducted to show the effects of forcing frequency and momentum coefficient of the dual synthetic jets on the aerodynamic performance. The results show that the optimum efficiency can be achieved when the frequency of the actuator is 1 and 2 times the characteristic frequency of the flow field, meanwhile the control is more efficient with the momentum coefficient increases.