摘要
A novel cooperative injection and suction jet was employed in this work to improve the power extraction characteristics of a semi-active flapping airfoil(S-AFA).The combined Taguchi method and numerical simulations was used to optimize the characteristic parameters of the cooperative injection and suction jet that affect the power extraction characteristics of the S-AFA.Under the Reynolds number of 6×10^(4)and the pitching axis location at the center of the ellipse airfoil,the effects of jet position,jet width,jet coefficient as well as phase difference between the cooperative injection and suction jet and the active pitching motion on the power extraction characteristics of the S-AFA are systematically examined.It is concluded that the power extraction characteristics of the S-AFA can be enhanced by employing cooperative injection and suction jet.Compared to the S-AFA without jet,the maximum efficiency is increased 11.06%for the S-AFA with optimized cooperative injection and suction jet.The flow structure behavior analysis shows that the vortex strength,the low pressure range in the suction surface of the airfoil as well as the pressure value in the pressure surface of the airfoil are increased due to the cooperative injection and suction jet,and it is why the power extraction characteristics of S-AFA can be improved.
基金
This work was supported by the National Natural Science Foundation of China(Grants 51975429 and 51705380)
the Wuhan Application Foundation Frontier Project(Grant 2019010701011404).
