Fundamentals of Engineering for Honors – ENG H192 Lab 4: Aerodynamics.

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Presentation transcript:

Fundamentals of Engineering for Honors – ENG H192 Lab 4: Aerodynamics

Fundamentals of Engineering for Honors – ENG H192 Airfoil Terminology

Fundamentals of Engineering for Honors – ENG H192 Angle of Attack

Fundamentals of Engineering for Honors – ENG H192 Lift and Drag Lift is defined as a force normal to the relative wind Drag is a force parallel to the relative wind

Fundamentals of Engineering for Honors – ENG H192 How is Lift Produced ? Air moving over the top of the wing has a higher velocity than the air on the bottom High Velocity = Low Pressure Low Velocity = High Pressure The resulting pressure difference causes a force that pushes up on the wing (aka lift)

Fundamentals of Engineering for Honors – ENG H192 How Angle of Attack and Camber Affect Lift

Fundamentals of Engineering for Honors – ENG H192 What About a Symmetric (no camber) Airfoil ?

Fundamentals of Engineering for Honors – ENG H192 Bottom Line: Cambered Vs Symmetric Cambered airfoils produced lift at zero angle of attack. Symmetric (no camber) airfoils do not produce lift at zero angle of attack

Fundamentals of Engineering for Honors – ENG H192 What Happens to an Airfoil when it Stalls ? Flow over the top surface separates from the airfoil, resulting in a high pressure wake region

Fundamentals of Engineering for Honors – ENG H192 Sources of Additional Airfoil Information How Airplanes work: NASA’s FoilSim II airfoil simulation program: 12/airplane/foil2.html 12/airplane/foil2.html Airfoil Database (Hint: look at low Reynolds number airfoils for the upcoming lab) : selig/ads/coord_database.html selig/ads/coord_database.html