RodG81
Newbie
Hello Everyone,
I am learning about autorotation. I understand the basic concepts including the forces acting on an airfoil and how the blade is divided in a driven, driving and stall regions with points of equilibrium between them.
The regions are different because the direction of resultant TAF (in relation to the axis of rotation) is different in each one of them: aft in the driven region, forward in the driving region and aligned in the points of equilibrium.
If I understand correctly the direction of the TAF is directly related to the angle of attack (the angle between the chord and the relative airflow).
I have a question regarding the driving region. Is there a specific angle (or range of angles) that would be optimum to maximize the movement of the blade forward? I am thinking it as follows: Imagine the side view of the airfoil with the chord aligned with the plane of rotation. If you could direct an airflow to the blade ¿which angle would you choose to have the best performance of the driving region?
For example, the image shows the airfoil with an AOA of 17º
Thank you!
I am learning about autorotation. I understand the basic concepts including the forces acting on an airfoil and how the blade is divided in a driven, driving and stall regions with points of equilibrium between them.
The regions are different because the direction of resultant TAF (in relation to the axis of rotation) is different in each one of them: aft in the driven region, forward in the driving region and aligned in the points of equilibrium.
If I understand correctly the direction of the TAF is directly related to the angle of attack (the angle between the chord and the relative airflow).
I have a question regarding the driving region. Is there a specific angle (or range of angles) that would be optimum to maximize the movement of the blade forward? I am thinking it as follows: Imagine the side view of the airfoil with the chord aligned with the plane of rotation. If you could direct an airflow to the blade ¿which angle would you choose to have the best performance of the driving region?
For example, the image shows the airfoil with an AOA of 17º
Thank you!