Sharp rotor

[PierreB]

Things are starting to clear up a little. With the same device (two Sharp rotors framing a VAWT rotor), but a slightly higher wind speed (7-9 m/s) I obtained from time to time a slight positive elevation angle of 5 or 10 degrees . From a wind speed of 10 m/s, the elevation angle is expected to increase significantly.

Remember that with the Sharp rotor located in the VAWT, everything fell like a stone even with a wind speed greater than 10 m/s.

The VAWT is slowed down little by the Sharp rotors, rotating here around 520 rpm, which is consistent with the 500 rpm of the VAWT alone with a wind of 8 m/s.

At high wind speed, the Sharp rotors are slowed down by this VAWT, whose TSR in strong winds decreases compared to the TSR of the Sharp rotor (which increases because the frictions are relatively less important), and becomes too low.

Sharp rotors providing lift to a VAWT

[PierreB]

Vertical and horizontal stacks, by adding a guide lifter kite above each column:

[PierreB]

If these Sharp rotors include on their respective axes regenerative brakes used to stop or slow down the rotation for the reel-in recovery phase, the recovered energy can be used for lighting, signaling, and powering electronic devices such as sensors, and even speakers for music or for alarm.