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Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
Aeronautics 1110x 3b-slides
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Aeronautics 1110x 3b-slides

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Aeronautics 1110x 3b-slides

Aeronautics 1110x 3b-slides

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  1. Ir.  Jos  Sinke   Li#   Introduc)on  to  Aeronau)cal  Engineering   Cyron  -­‐  CC  -­‐  BY  
  2. Li#  equa)on   J.  Scavini  -­‐  CC  -­‐  BY  -­‐  SA   L Li7  is  given  by:  
  3. Li#  equa)on   J.  Scavini  -­‐  CC  -­‐  BY  -­‐  SA   L Li7  is  given  by:   What  is  the  unit  of  CL?  
  4. Li#  coefficient   -­‐  The  ‘efficiency’  of  the  airfoil  in  generaFng  li7   -­‐  Depends  on  airfoil  &  angle  of  aKack        
  5. Airfoils  
  6. NACA  airfoil  nota)on   Leading  edge  (LE)   Thickness   Camber   Trailing  edge  (TE)   Chord  line  Chord  c   Mean  camber  line   NACA  2412  means:   -­‐  2%  camber  (of  chord  length)   -­‐  At  0.4  of  the  chord  (from  LE)   -­‐  And  12%  thickness/chord  raFo  
  7. Other  li#  parameters   Wing  surface  area  S  -­‐  A  design  parameter   Velocity  V  -­‐  A  design  parameter   Air  density  ρ  -­‐  Depends  on     alFtude  &  temperature   Revedavion.com  -­‐  CC  -­‐  BY  -­‐  NC  -­‐  SA  
  8. Where  does  li#  come  from?   Bernoulli’s  law:   “Sum  of  sta)c  and  dynamic  pressure  is  constant”       Higher  velocity  mean  lower  pressure!   So  li#  by  pressure  difference     V VV p pp
  9. Airfoil  li#   High  pressure   Low  pressure   L   D   Velocity  change   Pressure  distribu)on   Li#  &  Drag   Try  yourself:  NASA  Foilsim    
  10. Velocity  measurement   QuesFon:  Can  we  use  Bernoulli’s   law  to  measure  speed?             We  measure  airspeed   ptot  -­‐  ps   ptot   ps   ps   Pitot  tube  
  11. Li#  curve   CL  [-­‐]   α  [°]   CLmax   α  
  12. Take-­‐off  and  landing   -­‐  What  to  do  if  we  want  to  fly  at  low  speeds?       -­‐  W  does  not  change   -­‐  If  V  should  decrease,     CL  and/or  S  should  increase   -­‐  Devices  to  do  both!   Y.  Yosiaki  -­‐  CC  -­‐  BY  -­‐  SA  
  13. High  li#  devices   Aceebee  -­‐  CC  -­‐  BY  -­‐  NC  -­‐  SA   Flaps   Slats  
  14. High  li#  devices   Purpose:  Fly  at  low  speeds   By:    Increasing  criFcal      Increasing        Increasing  wing  area  S   Slats:   Flaps:   Slats  Flaps   CL  [-­‐]   α [°]   NiD.29  -­‐  CC  -­‐  BY  -­‐  SA  
  15. Wing  geometry   Wing  span   Wing  surface  area   Root  chord   Tip  chord   Taper  (=ct/cr)   Sweep  angle   D.  Busiak  -­‐  CC  -­‐  BY  -­‐  NC  -­‐  ND   S b ct   Λ   cr  
  16. Li#   M.  Visser  -­‐  CC  -­‐  BY  -­‐  SA  

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