Design of a Sine Driving Mechanism for the Dynamic Experiment of the Airfoil Model

We present the design principle and the structural characters of a sine driving system apparatus, which have been used since 1994 by NPU NF 3 wind tunnel in the dynamic stall experiment on the oscillating airfoil model. Some measures to improve the stability and flexibility are given. The obvious advantages of its simple structure and more accurate sine relationship between the oscillating angle of the model and the rotating angle of the engine have been proved in recent years. Tests show that this system is perfectly suitable for the study of the aerodynamic properties of the oscillating airfoil.