Friday, November 30, 2012

Notes - Chapter 3 Summary

The following notes are taken from Wind Turbine Technology by Ahmad Hemami.
  • Any object in the wind stream subject to a force from wind
    • Force an object depends on the form and size of the object
    • Force can result in torque
  • Force can be measured in pounds
    • Torque in foot-pounds
  • Forces are represented with vectors
    • force on a plate from wind depends on angle between plate and wind direction called angle of attack
    • aerodynamic forces include
      • drag
        • drag coefficient is ratio of drag force to aerodynamic force
      • lift
        • ratio of lift force to aerodynamic force
  • airfoil is a long thin object with a large lift coefficient but a small drag coefficient
    • leading edge confronts air
    • trailing edge leaves air
    • chord the width between the leading edge and trailing edge that is larger than the average thickness
    • chord line is the straight line between leading and trailing edge
    • gradual curves round leading edge, sharp trailing edge
    • low thickness to chord ratio

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