Analysis of Co-Flow Jet Effect on Dynamic Stall Characteristics Applying to Rotor Airfoils

4th International Conference on Mechanical and Aeronautical Engineering

机械制造;航空航天工程

Yang, Xu-Dong^1 ; Jiang, Wei-Rong^1 ; Zhang, Shun-Lei^1

School of Aeronautics, Northwestern Polytechnical University, Xi'an

710072, China^1

关键词: Blade elements;    Dynamic stalls;    Flow control techniques;    Lift enhancement;    Momentum coefficient;    Research teams;    Time-varying angles;    Turbulent mixing;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/491/1/012010/pdf
DOI  :  10.1088/1757-899X/491/1/012010

学科分类：航空航天科学

来源: IOP

【 摘 要 】

The performance of helicopter is limited by the phenomenon of dynamic stall. Dynamic stall is attributed to the time-varying angle of attack (AOA) of blade element resulting from blade flapping cyclic pitch inputs and wake flow. Co-flow jet(CFJ), as a novel flow control technique proposed by the joint research team from University Miami (UM) and AFRL has shown great improvement on lift enhancement, drag reduction due to its strong circulation improvement and turbulent mixing effect. Focusing on dynamic stall characteristics, this paper studies the effect of co-flow jet technique applying to rotor airfoil OA309. Numerical simulations show that CFJ can remove dynamic stall phenomenon occurring on rotor airfoils but the momentum coefficient should be carefully chosen so as to obtain high-efficient control effect.