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FluidMechInAAE

FluidMechInAAE - Fluid Mechanics in Aeronautics and...

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Fluid Mechanics in Aeronautics and Astronautics Marc Williams School of Aeronautics and Astronautics

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Aeronautics = Airplanes
Astronautics = Spacecraft

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Parts of Aero & Astro Aerodynamics Design Dynamics & Control Structures Propulsion

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Three forces from fluids LIFT - Force perpendicular to flight direction The Air pushes the airplane “up” DRAG - Force opposite the flight direction The Air pushes the airplane “back” THRUST - Force in the flight direction Internal pressure inside the engine pushes the
LIFT Newton say : The air pushes the airplane up So The airplane pushes the air down

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Cessna Citation
Boeing 777

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Boeing 757
DRAG The air sticks to the airplane, pushing it back (Viscosity== Friction drag) The airplane imparts kinetic energy to the air behind it…. This energy comes from the engines, And shows up as a drag (Induced Drag, or Drag due to Lift)

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Flight Regimes – A Vocabulary 0 0 1.0 2.0 3.0 6.0 Mach Number – M Altitude (1000 ft.) 100 80 60 40 20 Subsonic Supersonic Hypersonic Structural Limit (Dynamic pressure and heating) Aerodynamic Limit Transonic V = flight speed a = speed of sound M = V / a
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