S.D.M. College of Engineering & Technology

Department Of Mechanical Engineering

Seminar On

Aerodynamics of Wind TurbinesBy

Gururaja Murthy.D 2SD10ME037

Abstract:

In this seminar it is aimed at presenting a clear idea about the basics of wind energy and the aerodynamics behind the design of wind turbine blades.

Fundamentals of Wind Turbines

• Wind Power: Conversion of wind energy into a useful form of energy.

ex. wind turbine, wind mills, wind pumps

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

Fundamentals of Wind Turbines[1]

1. Foundation2. To electric grid3. Tower4. Access ladder5. Yaw Control6. Nacelle7. Generator8. Anemometer9. Brake10. Gearbox11. Rotor blade12. Pitch control13. Rotor Hub

Types of Wind Energy Conversion Devices[2]

1. Horizontal Axisi. Dutch Windmillii. Multiblade water pumping windmillsiii. High speed propeller type windmills

2. Vertical Axisiv. The savonius rotorv. The darrieus rotorvi. Giromill

Importance of Wind Energy

1. A country will become more self-sufficient by using alternatives such as wind power.

2. No CO₂ emissions

3. Creates jobs.

4. Can be used for charging batteries or can be combined with a diesel engine to save fuel

Importance of Wind Energy

Cumulative wind power addition from 1996 – 2013.[3]

Importance of Wind Energy

Annual wind power addition from 1996 – 2013[3]

Aerodynamics of Wind Turbine Blades[4]

1. Aerofoil structure

2. Long and slender blades

3. The span wise velocity component is much lower than the stream wise component

4. Hence it is assumed that the flow at a given radial position is 2-D and that 2-D aerofoil data can be applied.

Nomenclature of Airfoil and basic definitions

Nomenclature of aerofoil section[5]

Nomenclature of Airfoil and basic definitions

Different parameters of aerofoil section

NACA Profiles:

• NACA: National Advisory Committee for Aeronautics

• NACA 4 digit series:ex. NACA0012, NACA2415

Shape of an aerofoil

NACA Profiles:

• FL = ½ρAbw2CL N • FD = ½ρAbw2CD N

CL Vs CD for NACA2404 [5]

Blade element momentum theory[2]

References:

[2] S. N. Bhadra, D. Kastha, and S. Banerjee: “Wind Electrical Systems”, 1stEdition, Oxford publications.

[4]Martin O. L. Hansen: “Aerodynamics of Wind Turbines”, 2nd Edition published by Earthscan in the UK and USA in 2008. ISBN: 978-1-84407-438-9

[3]Global Wind Statistics 2013, released by Global Wind Energy Council on 05/02/2014

[5]DesignFOIL® R6 demo software.

[1] http://en.wikipedia.org/wiki/Wind_turbine_design

Conclusion:

1. Wind energy is gaining importance all over the world and it is important to study the technology behind it so that one can be able to harness more power from wind energy.

2. Countries like India should involve in R&D projects related to it and should generate more power from wind energy so that the dependence on coal will be reduced which reduces the import of coal.

Thank You