18-05-2012, 02:01 PM
Aerodynamics Lecture
Aerodynamics_2jyf.pdf (Size: 3.14 MB / Downloads: 184)
What is Aerodynamics
“A branch of dynamics that deals with the
motion of air and other gaseous fluids, and
with the forces acting on bodies in motion
relative to such fluids” – Webster’s
Dictionary
Lift and Balloons
Buoyancy is easiest way of generating lift
q Archimedes principle
• Difference in pressure on surface of a body =
volume displaced
• Weight of fluid displaced = buoyant force
What is drag
Aerodynamic force that opposes an
aircraft’s motion through the air, caused by
interaction and contact of a solid body with
a fluid
Aerodynamic friction
Aerodynamic resistance to motion
Depends on wing shape, angle of attack,
effects of air viscosity and compressibility
Induced drag
Arises from 3-dimensional effects of a
wing caused by downwash velocity near
wing tip
Vortices create a downward velocity
component at the wing
Non-dimensional coefficient of induced
drag: