First of thanks to NREL for developing Harp_Opt code.
I modeled a 3 m hydrokinetic turbine rotor and get the twist, and chord distributions.
My questions are that;
Where is the exact location of blade pitch axis in Harp_Opt? (There are different approaches such as 25, 30 or 33 % of chord)
On the other hand, what is the exact meaning of pre-twist angle. Is it the angle between tangential velocity vector(direction of motion) and the airfoil chord line? Or it is the angle between the tangential velocity vector and the relative velocity vector?
Consequently, how can I export the axial and radial induction factors for each blade element , for different free stream velocities in Harp_Opt?