Introduction to Wind Turbine.pdf

Figure 2 two bladed versus three bladed wind turbines

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Figure 2. Two-bladed-versus-three-bladed wind turbines. Three-bladed turbines require lower wind speeds than two-bladed turbines to produce comparable power levels, since they present a larger area facing the wind. Their operation is smoother and quieter than two-bladed turbines. They are less affected by the undesirable effects caused by the presence of the tower and the variations in wind speed. However, three-bladed turbines are usually heavier and more expensive than two-bladed turbines. Also, they are generally more difficult to install. Vertical axis wind turbines (VAWT) Vertical-axis wind turbines have a shaft whose axis of rotation is perpendicular to the ground and the direction of the wind. The main advantage of vertical-axis wind turbines is that they do not need to be oriented into the wind, so that there is no need for a yaw control mechanism. Furthermore, they do not need a tower. These turbines can therefore be constructed and installed at a lower cost. The main drawback of vertical-axis wind turbines is that they operate at lower speeds than horizontal-axis wind turbines, because they are not perched on towers. Furthermore, the air flow is more turbulent near the ground, which can result in vibrations, noise, blade stress, and poor overall efficiency.
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Introduction – Wind Turbines Discussion of Fundamentals Introduction to Wind Power 5 Figure 3 shows a vertical-axis wind turbine of the Darrieus type. This turbine has two curved blades tied to the top and bottom of the shaft, like the blades of an eggbeater. The shaft is connected to a gear box and a generator is placed near the ground. Figure 3. Vertical-axis wind turbine (Darrieus rotor). Small scale wind power This manual focuses onto small-scale wind power , that is, the production of relatively modest amounts of electrical energy, mainly for domestic use, by means of small-size wind turbines. Most small-size wind turbines used these days are of the HAWT type. The operation of this type of small-size turbine is covered in detail ed in the practical . Guy wire Rotor blades Rotor shaft Wind Generator Gear box
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