Modifying the blades shape and twist will change the ratio between the tip speed of the blade and incoming wind speed (TSR, tip speed ratio) with a lesser number of blades able to spin at a higher TSR.
The design of the generator determines the voltage and power produced, both of which increase with rotational speed in revolutions per minute (RPM). The generators specified RPM needs to closely match the turbines RPM at operating wind speeds to produce the power and voltage rated on the generators plate.
The power that can be converted into electricity from wind energy is proportional to the circular 'swept' area that the blades cover as they rotate. An increase in power requires a greater swept area to be covered. The square of the blade radius is proportional to area and also power produced.
The average windspeed is adjusted to suit the location and can be useful to approximate the increases in blade radius required for low wind speed.
The average windspeed is adjusted to suit the location and can be useful to approximate the increases in blade radius required for low wind speed.
Online Blade Calculator Software
Adjusting the TSR in the appropriate range can more suitably match the blades to the generators RPM.
Two bladed turbines operate in a TSR range between 8 and 10, with 3 bladed turbines spinning at a TSR between 6 to 7.
Two bladed turbines operate in a TSR range between 8 and 10, with 3 bladed turbines spinning at a TSR between 6 to 7.
