This document discusses the history and design of wind turbine blades. It begins with an overview and introduction to wind energy and the need for innovation. It then covers the causes of wind, the early history of wood and steel blades, and trends in modern blade sizes that can be over 124 meters long. The document outlines material selection requirements for blades, including stiffness, low density, and fatigue life. It also discusses aerodynamic blade design principles and advantages such as longer lifespan and weight reduction compared to other materials, as well as generating more power. Disadvantages are also noted but not described.

1. LOGO
PRESENTED BY
RITHIN R
4MH11ME094
Under the Guidance of
Prof B.Harish
Department of Mechanical Engineering

3. OVERVIEW
• INTRODUCTION
• HISTORY
• SELECTION OF MATERIALS
• AERODYNAMIC DESIGN OF WIND TURBINE BLADES
• ADVANTAGES and DISADVANTAGES

4. INTODUCTION
• Wind energy as Resource
• Need for innovations

5. Causes for Wind
• Due to Pressure difference
• Deflection of Winds due to Earth rotation

6. Causes due to Temperature
• Due to Temperature gradients
• land gets heats up quickly resulting in low pressure
• Ocean being a large reservoir remains same pressure

7. HISTORY
• Wood was the First to be used as Blade
• in late 19th century wood was replaced with
thin sheets of galvanized steel
• Furthermore era of alloys had arrived
• Because of its wieght using alloys were
abandoned
• Th

8. Trends in utility-scale wind turbines
50kW 100kW 500kW 600kW 2000kW 5000kW
Ø 15m Ø 20m Ø 40m Ø 50m Ø 80m Ø 124m

9. Material selection Requirements
• High material stiffness is needed to maintain
optimal shape of performance.
• Low density is needed to reduce gravity forces
• Long-fatigue life is needed to reduce material
degradation.

10. Ashby's material selection chart

11. Areodynamic Design
• Blade Design will be as similar to aeroplane wings
• we need more lift and less Drag to cause rotation
• lift can be increased by increasing angle of attack
• it must be high in solidity

12. Advantages
• More life span for Turbine Blades compared to Wood
• Weight is less compared ferrous materials and alloys
• Good fatigue characteristics
• Gains the momentum in quick time
• Solidity in airfoils
• More power can be Generated in terms of Mega
Watts.

13. Disadvantages

14. LOGO

15. Thank You
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