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
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Astronautics = Spacecraft
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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
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LIFT Newton say : The air pushes the airplane up So The airplane pushes the air down
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Cessna Citation
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Boeing 777
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Boeing 757
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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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FluidMechInAAE - Fluid Mechanics in Aeronautics and...

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