WIND ENERGY By Manjunath Terwad Outline Wind Turbines

WIND ENERGY By: Manjunath Terwad

Outline • • • Wind Turbines How Wind Turbine Works? Types of Wind Turbines Horizontal Axis Wind Turbine Vertical Axis Wind Turbine Advantages & Disadvantages

Wind Turbines • A wind turbine is a rotating machine which converts the kinetic energy in wind into mechanical energy. • If the mechanical energy is used directly by machinery, such as a pump or grinding stones, the machine is usually called a windmill. • If the mechanical energy is then converted to electricity, the machine is called a wind generator or wind turbine.

How Wind Works ? LIFT AND DRAG • Old-fashioned windmills use DRAG • DRAG devices are pushed by the wind • Modern wind turbines use LIFT • LIFT devices work like airplane wings

Aerodynamics of Wind Turbine Blades Forces are transmitted from a moving fluid to an object in the flow stream Lift = the force component perpendicular to the original flow direction Drag = the force component in line with the original flow direction

How Wind Turbine Works ? A wind turbine works the opposite of a fan. The wind turns the blades, which spin a shaft, which connects to a generator and makes electricity. This aerial view of a wind power plant shows how a group of wind turbines can make electricity for the utility grid. The electricity is sent through transmission and distribution lines to homes, businesses, schools, and so on.

Types of Wind Turbine • Turbines can be categorized into two classes based on the orientation of the rotor. 1. Vertical Axis 2. Horizontal Axis Darrieus Type

Vertical Axis Wind Turbine 1. Vertical Axis Wind Turbine In this type of wind turbine the axis of rotation is perpendicular the ground. Vertical-axis wind turbines fall into two major categories: • • Savonius Darrieus Savonius Type

Horizontal Axis Wind Turbine Horizontal axis turbines the axis of rotation is parallel to the ground. When the wind passes over both surfaces of the airfoil shaped blade it passes more rapidly over the upper side of the airfoil. The pressure differential between top and bottom surfaces results in aerodynamic lift like airplane blades

Advantages Of Wind Turbine Environmental friendly No air pollution Wind energy is renewable No greenhouse gasses Expanding Wind Power development brings jobs to rural communities

Disadvantages May create a lot of noise. Wind can never be predicted. Wind energy depends upon the wind in an area and therefore is a variable source of energy. It covers a large area.

Thank You