Make a Wind Generator presentation on how wind power works

Pasadena Public Library
May. 27, 2017

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Make a Wind Generator presentation on how wind power works

  1. Hands-on Science and Engineering at Pasadena Public Library May 19, 2017
  2. Energy cannot be created or destroyed; it can only be converted from one form to another.
  3. “In the case of a wind-electric turbine, the turbine blades are designed to capture the kinetic energy in wind. The rest is nearly identical to a hydroelectric setup: When the turbine blades capture wind energy and start moving, they spin a shaft that leads from the hub of the rotor to a generator. The generator turns that rotational energy into electricity. At its essence, generating electricity from the wind is all about transferring energy from one medium to another.” nmental/green-science/wind-power.htm
  4. You will want your blades to move as fast as possible without creating too much air turbulence, because more revolutions per minute (RPM) means more energy. energy-power-point-and-audio formula-for-kinetic-energy.html
  5. As the windings are energized, they attract to the magnets located around the motor. This rotates the motor until the brushes make contact with a new set of commutator contacts. This new contact energizes a new set of windings and starts the process again. To reverse the direction of the motor, simply reverse the polarity on the motor contacts. Sparks inside a brush motor are produced by the brush jumping to the next contact. Each wire of a coil is connected to the two closest commutator contacts.
  6. *Windpumps were first used by Muslims in the Middle East and Central Asia in the 9th century *The first known instance of using wind to power a machine was by the Greek inventor Hero of Alexandria in the 1st century? He invented a wind powered organ with a wind wheel that powered a piston and forced air into pipes (see upper left). *Dutch windmills were not only about making flour. Many windmills also pumped water out of the ground, which was necessary because most of the Netherlands is below sea level.
  7. p. 17, Wind Power by Ian Graham, published by Raintree Steck- Vaughn Publishers
  8. To understand that, you need to see what the wind looks like hitting sails that DON’T have slots:
  9. When the air is allowed to flow both through the wing and around it, the wing is more likely to move. Just like a fly swatter!
  10. “In drag-based wind turbines, the force of the wind pushes against a surface, like an open sail. In fact, the earliest wind turbines, dating back to ancient Persia, used this approach. The Savonius rotor is a simple drag- based windmill that you can make at home (Figure 1). It works because the drag of the open, or concave, face of the cylinder is greater than the drag on the closed or convex section.” tanddrag.html
  11. “This requires specially shaped airfoil surfaces, like those used on airplane wings (Figure 2). The airfoil shape is designed to create a differential pressure between the upper and lower surfaces, leading to a net force in the direction perpendicular to the wind direction. Rotors of this type must be carefully oriented (the orientation is referred to as the rotor pitch), to maintain their ability to harness the power of the wind as wind speed changes.” ag.html
  12. Wind-Turbines-Work/
  13. Build a wind generator that can light an LED bulb!
  17. tal/green-science/wind-power3.htm Generally speaking, doubling the rotor diameter produces a four-fold increase in energy output. But unless you’re in a high-wind area, longer blades might just get too heavy. Longer blades also increase DRAG.
  18. * city/Domain/307/wind_turbinebladedesign.pdf
  19. What if your LED won’t light up? It might need to have its legs flipped around. Electrical current from a battery or generator always flows in one direction, opposite to the direction the electrons are moving in. We have a “positive” and a “negative” side to batteries and other instruments to help us orient them the correct way.