Question

How many types are acting on propeller type wind mill?

(a) 2

(b) 3

(c) 4

(d) 5

The question was asked in an interview for job.

My enquiry is from Velocity and Power from Wind in division Wind Energy of Energy Engineering

Answer 1

The correct option is (a) 2

The best explanation: There are two types of forces operating on the blades of a propeller type wind turbine. They are the circumferential forces in the direction of wheel rotation that provide the torque and the axial forces in the direction of the wind stream that provide an axial thrust that must be counteracted by proper mechanical design.