Your SlideShare is downloading. ×
Wind Turbine
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Wind Turbine

8,119
views

Published on

Published in: Business, Technology

3 Comments
5 Likes
Statistics
Notes
  • Such a detailed presentation! It's clear and highly informative. Thanks for this set!
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • thanx
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
  • Nice presentation. The information was introduced in a very detailed manner. There were calculations shown which is effective since you are giving a specific detail about the topic. It was explained further to the benefit of many. With this, many will be influenced to use wind turbines because of its many benefits.
       Reply 
    Are you sure you want to  Yes  No
    Your message goes here
No Downloads
Views
Total Views
8,119
On Slideshare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
640
Comments
3
Likes
5
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. Wind Turbines
    By: Ahmed Yehya Mohamed MohamedSameh MohamedMohamed MahmoudMoustafaMina FaragAdlyMohamed Anwar
  • 2. wind
  • 3. Wind power calculation
    Power= work / time
    = Kinetic Energy / t
    = ½mV2 / t
    = ½(ρAd)V2/t
    = ½ρAV2(d/t)
    = ½ρAV3
    Power in the Wind = ½ρAV3
  • 4. Inside a Wind Turbine
  • 5.
  • 6. Types of wind turbines according to power
    Small (10 kW)
    (e.g. water pumping, telecom sites, icemaking)
    Intermediate
    (10-250 kW)
    • Village Power
    • 9. Hybrid Systems
    • 10. Distributed Power
    Large (250 kW - 2+MW)
    • Central Station Wind Farms
    • 11. Distributed Power
  • Types of wind turbinesaccording to design
  • 12. Horizontal axis turbines
    advantages
    Variable blade pitch, which gives the turbine blades the optimum angle of attack
    The tall tower base allows access to stronger wind in sites with wind shear.
    High efficiency, since the blades always move perpendicularly to the wind, receiving power through the whole rotation.
    disadvantages
    Tall towers and blades up to 90 meters long are difficult to transport. Transportation can now cost 20% of equipment costs.
    Tall HAWTs are difficult to install, needing very tall and expensive cranes and skilled operators
    Massive tower construction is required to support the heavy blades, gearbox, and generator
  • 13. Vertical Axis Turbines
    Advantages
    Omnidirectional
    Accepts wind from any angle
    Components can be mounted at ground level
    Ease of service
    Lighter weight towers
    Can theoretically use less materials to capture the same amount of wind
    Disadvantages
    Rotors generally near ground where wind poorer
    Centrifugal force stresses blades
    Poor self-starting capabilities
    Requires support at top of turbine rotor
    Requires entire rotor to be removed to replace bearings
    Overall poor performance and reliability
    Have never been commercially successful
  • 14. Vertical Axis Turbines
    advantages
    Omnidirectional
    Accepts wind from any angle
    Components can be mounted at ground level
    Ease of service
    Lighter weight towers
    Can theoretically use less materials to capture the same amount of wind
    Disadvantages
    Rotors generally near ground where wind poorer
    Centrifugal force stresses blades
    Poor self-starting capabilities
    Requires support at top of turbine rotor
    Requires entire rotor to be removed to replace bearings
    Overall poor performance and reliability
    Have never been commercially successful
  • 15. Classification according to number of blades
  • 16. Number of Blades – One
    Rotor must move more rapidly to capture same amount of wind
    Gearbox ratio reduced
    Added weight of counterbalance negates some benefits of lighter design
    Higher speed means more noise, visual, and wildlife impacts
    Blades easier to install because entire rotor can be assembled on ground
    Captures 10% less energy than two blade design
    Ultimately provide no cost savings
  • 17. Number of Blades - Two
    Advantages & disadvantages similar to one blade
    Need teetering hub and or shock absorbers because of gyroscopic imbalances
    Capture 5% less energy than three blade designs
  • 18. Number of Blades - Three
    Balance of gyroscopic forces
    Slower rotation
    increases gearbox & transmission costs
    More aesthetic, less noise, fewer bird strikes
  • 19. Airfoil Nomenclaturewind turbines use the same aerodynamic principals as aircraft
  • 20. 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!!
  • 21. ΩR
    Ωr
    α
    V
    V
    VR = Relative Wind
    Apparent Wind & Angle of Attack
    α = angle of attack = angle between the chord line and the direction of the relative wind, VR .
    VR = wind speed seen by the airfoil – vector sum of V (free stream wind) and ΩR (tip speed).
  • 22. Twist & Taper
    Speed through the air of a point on the blade changes with distance from hub
    Therefore, tip speed ratio varies as well
    To optimize angle of attack all along blade, it must twist from root to tip
    Fastest
    Faster
    Fast
  • 23. Wind turbines sites
  • 24.
  • 25. “The rotor is the single most critical element of any wind turbine… How a wind turbine controls the forces acting on the rotor, particularly in high winds, is of the utmost importance to the long-term, reliable function of any wind turbine.” Paul Gipe
    Rotor Controls
    Micro Turbines
    May not have any controls
    Blade flutter
    Small Turbines
    Furling (upwind) – rotor moves to reduce frontal area facing wind
    Coning (downwind) – rotor blades come to a sharper cone
    Passive pitch governors – blades pitch out of wind
    Medium Turbines
    Aerodynamic Stall
    Mechanical Brakes
    Aerodynamic Brakes
  • 26. Turbine Power Limited By
    • Power in the wind
    • 27. Betz limit (air can not be slowed to zero)
    • 28. Low speed losses - wake rotation
    • 29. Drag losses – aerodynamics and blade geometry
    • 30. Generator and drivetrain inefficiencies
  • Thank you