Wind turbines convert kinetic energy from wind into electrical power. They are designed using aerodynamic modeling to determine the optimal tower height, control systems, number of blades, and blade shape for the location. Conventional horizontal axis turbines have three main components: the rotor, generator, and structural support tower. Most use three blades for balance and slower rotation to reduce costs and increase efficiency. The airfoil shaped blades create lift and drag forces, with lift being maximized for efficiency. Small wind turbines can provide energy in off-grid areas, while wind power is becoming increasingly competitive with other sources and can power irrigation and desalination.

1. Wind turbines types
and construction.
By :
Shashank
120101MER136
Mechanical-C

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

3. 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.

4. 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

5. Number of Blades - Three
• Balance of
gyroscopic forces
• Slower rotation
– increases gearbox &
transmission costs
– More aesthetic, less
noise, fewer bird
strikes

6. 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 = High
Stall!!

7. Airfoil Shape
Just like the wings of an airplane,
wind turbine blades use the
airfoil shape to create lift and
maximize efficiency.
The Bernoulli Effect

8. 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.

9. 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.