Wind turbines typesand construction.

By :Shashank

120101MER136Mechanical-C

Introduction :

• A wind turbine is a device that converts kinetic energy from the wind into electrical power.

Turbines :

• Wind turbines are designed to exploit the wind energy that exists at a location. Aerodynamic modelling is used to determine the optimum tower height, control systems, number of blades and blade shape.

• Wind turbines convert wind energy to electricity for distribution.

Continued :

Wind turbines convert wind energy to electricity for distribution. Conventional horizontal axis turbines can be divided into three components:• The rotor component, • The generator component - includes the electrical generator,

[29][30] the control electronics, and most likely a gearbox (e.g. planetary gearbox),[31] adjustable-speed drive[32] or continuously variable transmission[33] component for converting the low speed incoming rotation to high speed rotation suitable for generating electricity.

• The structural support component includes the tower and rotor yaw mechanism.[34

Number of Blades - Three

• Balance of gyroscopic forces

• Slower rotation– increases gearbox &

transmission costs– More aesthetic, less

noise, fewer bird strikes

Lift & Drag Forces

• The Lift Force is perpendicular to the direction of motion. We want to make this force BIG.

• The Drag Force is parallel to the direction of motion. We want to make this force small.

α = low

α = medium<10 degrees

α = HighStall!!

Airfoil ShapeJust like the wings of an airplane, wind turbine blades use the airfoil shape to create lift and maximize efficiency.

The Bernoulli Effect

Small wind turbines

• Small wind turbines may be used for a variety of applications including on- or off-grid residences, telecom towers, offshore platforms, rural schools and clinics, remote monitoring and other purposes that require energy where there is no electric grid, or where the grid is unstable.

Future of wind power :

• Wind turbines are seen to be increasingly competitive with conventional energy generating sources..

• Wind turbines have also proven valuable in providing power for irrigation, watering cattle, cooling and desalination.

Thank you