Study on Dynamic Stall Control of Rotor Airfoil Based on Coflow Jet

In this study, a dynamic stall control strategy, called the co-flow jet (CFJ), is applied to the rotor airfoil. The effect of the CFJ on the unsteady dynamic stall characteristics of the rotor airfoil is numerically investigated via numerical simulations of the unsteady Reynolds-averaged Navier-Stok...

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Bibliographic Details
Published in:International journal of aerospace engineering 2020, Vol.2020 (2020), p.1-15
Main Authors: You, Yancheng, Qiu, Ruofan, Chen, Rongqian, Liu, Jiaqi, Zhang, Weiguo
Format: Article
Language:English
Subjects:
Aerodynamic characteristics
Aerodynamic stability
Aerodynamics
Aerospace engineering
Blending effects
Computational fluid dynamics
Control stability
Diffusion layers
Finite volume method
Momentum
Numerical methods
Reynolds averaged Navier-Stokes method
Rotors
Shear layers
Simulation
Stalling
Suction
Systems stability
Turbulence models
Velocity
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Summary:In this study, a dynamic stall control strategy, called the co-flow jet (CFJ), is applied to the rotor airfoil. The effect of the CFJ on the unsteady dynamic stall characteristics of the rotor airfoil is numerically investigated via numerical simulations of the unsteady Reynolds-averaged Navier-Stokes (URANS) equations coupled with the Spalart-Allmaras (S-A) turbulence model. The numerical methods are validated by a NACA0012 pitching airfoil case and a NACA6415 airfoil case based on the CFJ, and good agreement with experiments is found. Via the study of the typical conditions of CFJ control to suppress the dynamic stall of the OA212 rotor airfoil, it is verified that this method has a good effect on dynamic stall suppression. The diffusion and blending of the turbulent shear layer between the CFJ injection jet and the main flow excite the main flow and enhance its ability to resist the reverse pressure gradient; this suppresses the generation and development of the separation vortex, thereby enhancing the aerodynamic characteristics, improving the hysteresis effect, and increasing the system stability. On this basis, the control parameters of the CFJ are further studied, including the influences of the jet momentum coefficient and the positions and sizes of the injection and suction slots on suppressing the dynamic stall of the rotor airfoil. It is found that there is a jet momentum coefficient that optimizes the suppression effect of the dynamic stall of the rotor airfoil. Moreover, the position of the injection slot is found to have a greater effect on the dynamic stall suppression, while the size of the injection slot and the position and size of the suction slot have little effect.
ISSN:1687-5966
1687-5974
DOI:10.1155/2020/8845924