![]() Let’s take a look at the diagram below and find the linear speed for blades that make a complete rotation every second. As the radius of the blade decreases at different points closer to the center rotor, the linear speed decreases. Since the radius is the longest at the tip of the turbine it is the point of the blade with the highest linear speed. Linear Speed of Blade = circumference / unit of time Since the distance is measured as the circumference: Linear Speed of Blade = distance traveled / unit of time The linear speed of the wind turbine varies with the blade length, and also varies at different points on the same blade. Linear speed is the measurement of a length traveled during a unit of time.įor example riding a bike down the street at a speed of 15 miles/hour. There are two different speed measurements used for the speed of a wind turbine blades: linear speed, and angular speed. The wind turbine tip speed is a measurement of how fast the end tip of a wind turbine blade is moving.Įvery unique wind turbine has a different optimum blade speed that produce the highest amount of electrical power during operation. In this particular graph the cut-in speed of the turbine is around 11 mph and the furling speed is when the output begins to decline around 15 mph. The graph above is a generic graph of no particular wind turbine generator, but still says a lot about the relationship between wind speed and power output. The furling speed is the wind speed at which a turbine generator will shut off and stop generating power, usually to prevent damage to the turbine in cases of extraordinarily high wind speeds. At low wind and rotational speeds the turbine generator will produce no power until the wind speeds reach the required cut-in speed for that particular wind turbine. Just because the rotor and the blades are spinning, it does not mean that the generator is producing power. This is a crucial piece of information to understand about wind turbine generators. The more important, cut-in speed, is the wind speed at which the turbine generator will begin to produce electricity. The start-up speed is the minimum wind speed needed for the rotor and the blades to begin spinning, this low rotational speed will not provide any usable electric power. This is because all wind turbines have a distinct start-up speed and a cut-in speed. Notice from the graph that at very low wind speeds the power output is near zero. So, for example, if you were to double the wind speed, you would increase the power output by 8 times, it is easy to see this relationship in the graph provided below. Wind speed has an approximately cubic relationship with energy output. ![]() The greater the wind speed, the greater the energy output, assuming everything else is kept unchanged. Wind speed is a contributing factor to the energy output potential of a wind turbine. An anemometer is a device used to measure wind speed.Īnemometers are often attached to wind turbines to control the start-up mechanism of wind turbines in low wind speeds, and also the shutting down of wind turbines in dangerously strong winds.
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