Windcar

1
Windcar

• Gymnasium Eliky Krásnohorské
• Ohradní 55
• 2005

2
Task
Construct a car which is propelled solely by wind
energy. The car should be able to drive straight
into the wind. Determine the efficiency of your
car.
3
Table of contents

• Wind turbine types
• Darrieus type wind turbine
• Our model
• Testing model (video)

4
Wind turbine types

• Dutch four arm
• High speed propeller

• Cup anemometer
• Darrieus type

5
Axis
Horizontal X Vertical

• High efficiency rotor
• Easy-to-build rotor
• Simpler calculation of efficiency

• Totally independent on wind direction
• No special gearbox
• Low model height

6
Darrieus type wind turbine

• Invented in 1931 by G. J. M. Darrieus
• 2, 3 or 4 aerodynamic airfoils blades
• Powered by lift forces
• Efficiency max. 45 (depends on dimensions)

7
Our model

• Polystyrene airfoils NACA0015
• Low weight (120g)
• Dimensions 36x36x19cm
• Approx. Efficiency 2

8
Aerodynamic tunnel

• Inner dimensions 25x50x200cm
• 1,4kW wood-dust extractor used
• typically wind speed 3m/sec.

9
Testing (video)
10
Recapitulation

• Analysis wind turbine problem
• Select optimal solution
• Develop functional model
• Model testing
• Results analysis