Abstract:
The effect of dual synthetic jets actuator (DSJA) and jets parameters is studied on the flow separation of cylindrical surface by a two-dimensional numerical simulation. The results show that the characteristics of the simulated flow field are consistent with the theoretical and actual distribution. When the working frequency of the actuator is equal to the characteristic frequency of the wake vortices shedding with constant actuator amplitude, the control effect of flow separation is the best. Keeping the actuator frequency as the characteristic frequency, the momentum blending effect of the jet on the flow field is enhanced by increasing jet amplitude, and the control effect is also enhanced. Finally, the control mechanism of the synthetic dual jet at the front stagnation point and the back stagnation point of the cylinder is illustrated. The control effect at front stagnetion mainly decreases the drag through the virtual aerodynamic shape formed by the jet; the control at back stagnation point is realized mainly through the jet forming a low pressure zone at the back edge of the cylinder to accelerate and promote the reattachment of the separation vortex to decreases the drag.