Dependence of Solidity, γ on Tip Speed Ratio λ The variation of solidity, γ versus the tip speed ratio, λ  is shown in Figure B. Following points can be observed : Rotor with high tip speed ratio have low value of solidity. Rotors turn at high speed. Rotor with low tip speed ratio have high value of solidity and they turn … Read more

Dependence of Power Coefficient, Cp on Tip Speed Ratio, λ The dependence of power coefficient on tip speed ratio is typically shown in Figure for various types of turbine rotors. Following points can be observed from the graph.  Each type of wind mill has some optimum tip speed to wind speed ratio, λ at which it gives maximum Cp. … Read more

Vertical Axis Wind Turbine (VAWT) The schematic diagram of a vertical axis wind turbine with Darrieus type two bladed rotor is shown in Figure. The advantages of vertical axis turbines over horizontal axis turbines are : It does not need any yaw control mechanism since vanes of the wind mill can accept the wind from … Read more

Horizontal Axis Wind Turbine (HAWT) Generator Horizontal axis wind turbine generators are being used all over the world successfully. The main component of a propeller type wind generator is shown by a schematic diagram in Figure A. Figure A Usually it has two or three blades made of wood (for low power generation) or high … Read more

Classification of Wind Mills The wind mills can be classified as follows : Based on orientation of the axis of rotor  (a) Horizontal axis (b) Vertical axis Based on type of rotor Propeller type (Horizontal axis) Multiple blade type (Horizontal axis) Savonius type (Vertical axis) Darrieus type (Vertical axis) 1. Horizontal Axis Wind Mills : … Read more

Advantages and Disadvantages of Wind Energy Wind power can be used to run water pumps, charging of batteries and for electric generation of power. Wind energy can be used where wind speeds are reasonably high in the range of 8 to 40 kmph. Such wind speeds are available along the sea cost at high altitudes … Read more

Causes of Wind Winds can be broadly classified as planetary and local winds. 1. Planetary winds : Planetary winds are caused due to greater solar heating of the earth’s surface near the equator as compared to solar heating near the northern or southern poles. It causes the hot air to rise from equator to poles … Read more

Introduction of Wind Energy Introduction : Wind energy is an indirect form of solar energy since wind is introduced chiefly by the meven heating of the earth’s crust by the sun. The conversion of this wind energy into electrical power can reduce the power deficit to a large extent. In contrast to direct solar radiations, … Read more