wind turbine blade design project ppt

7/22/2019 Wind Turbine Blade Design Project PPT

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Alternatives to Electricity

Generation?



What do we commonly use

electricity for?

KidWind Project | www.kidwind.org



Where does all of this electricity

come from?

• Brainstorm together where the energy we

use on a day-to-day basis is generated.




The Reality of United States

Energy Production• Fossil Fuels 70%

• Nuclear 20%

• Hydro 7%

• Renewables 2.5 %

• Other 0.5%




Typical Coal Fired Power Plant





What does a wind turbine do?



Many Different Rotors…




Wind Turbine Blade Challenge• Students perform

experiments and designdifferent wind turbine blades

• Test one variable while

holding others constant

• Record performance with a

multimeter or other loaddevice

• Goals: Produce the most

voltage – Minimize Drag

– Maximize LIFT – Harness the POWER of the

wind!



Price Performance Ratio?

What does it mean?

• Ability to deliver

performance for it’s price(in this case, cost)

= _ Price _

Performance

• Will be using the total

cost of design per current

generated (A)

What can it communicate

to us?

• What kind of values do we want

for price? What aboutperformance?

• What does a lower ratio value

communicate? A higher value?

• What can we determine about

everyone’s designs if we

compare all values?



REVISITING YOUR DESIGN

Rethinking design characteristics:



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



Lift/Drag Forces

Experienced by

Turbine Blades




Twist & Taper

•Speed through the air of apoint on the blade changes

with distance from hub

• Therefore, tip speed ratio

varies as well

• To optimize angle of attackall along blade, it must twist

from root to tip

Fast

Faster

Fastest



Manufacturing Blades

The blade mold (left) is lined with layers of fiberglass, then injected with epoxy

resin. To enhance stiffness, a layer of wood is placed between the fiberglass

layers. The two molds are joined and adhered together using a special liquid

epoxy, which evenly joins the two sides of the blade.

Finally, the whole mold is baked like a cake! 8 hours at 70 degrees C.



Time to Re-Design!

wind turbine blade design project ppt

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