Abstract:
An active suction and blow method was used to the flow control of circular cylinders, including blowing at front and rear stagnation points, suctioning at front stagnation point and blowing at rear stagnation point, blowing at front stagnation point and suctioning at rear stagnation point, and suctioning at front and rear stagnation points. The control effects were simulated through Large-Eddy Simulation (LES) at a
Re of 300. The results of the aerodynamics and wake flow show that blowing at rear stagnation point could suppress the fluctuation of the lift force dramatically, due to the air blowing from the stagnation point reduces the influence of the wake vortexes. The reduction rate of the lift fluctuation reaches up to 92% when
Us-b/
U=1. It is also found that the air blowing from front stagnation point makes the shape of the cylinder more streamlined, and the pressure in the front zone of the cylinder decreases significantly, which can lead to a significant drag reduction.