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Aero II

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Thin airfoil approximation for finite camber. Flaps and Slats. Airfoil Geometry ... on Airflow. Slats do not add camber. Leading edge extension. Wing tips ... – PowerPoint PPT presentation

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Title: Aero II


1
Aero II Lecture 29 Wing Modification III
J. E. Brandenburg EAS 3101 Spring 2007
2
Agenda
  • Historic Wing Innovations
  • Thin airfoil approximation for finite camber
  • Flaps and Slats

3
Airfoil Geometry
Highly evolved systems were adopted to describe
wing geometries
4
Fly by Wire Electric Control of Airframes in
WWII
  • Control accomplished by simple pressure sensors
    and electro-mechanical sequencers ( delayers
    and relays)
  • Stall warning accomplished by pressure sensors on
    wings
  • Sequencers activated electric motors driving
    screw jacks to deploy wing extensions or move
    control surfaces
  • Success of these technologies led to modern
    dynamically stable aircraft

5
Electric Actuator
Based on worm drive or screw jack principle of
high force from small motor
6
Unstable Airframes F-117
7
WWII Wing Inovations
8
Me 109
9
Dauntless
10
Dauntless Dive Flaps
11
Control Surfaces
12
Circulation
13
Bernoulli Equation
14
Camber Cont.
Camber is positive on front of wing and negative
on back
Camber term
15
Biot-Savart Law
Effect of localized vorticity falls off as 1/r
16
On Camberline

x
17
Camber line is Streamline of flow

18
Straight Camber Line Airfoil(symmetric)

19
Coordinate Transform


20
Analytic Case


21
Analytic Case


?(x)
0
x
Most of lift is at front of the wing!
22
Local Vorticity
23
Lift Profile on Wing
Region of lowest pressure
Fast air
24
Pressure Over Wing
Red marks low pressure
25
For thin symmetric airfoil



CL
?
26
Straight Camber Line Airfoilcambered)
27
Effect of Finite Camber
28
For thin cambered airfoil



29
(No Transcript)
30
Producing Camber
31
Straight Camber Line Airfoil(symmetric)

32
Straight Camber Line Airfoilwith flap depressed

33
Effect of Flap Camber
34
Flap Action For Small Angles
l
35
Flap Designs
36
Slat Designs
37
Slats or Leading Edge Extension
38
Effect of Slats on Camber
Zero at front of wing
39
Slats and Flaperons
40
Slats
41
Stalls
42
Slats Prevent Boundary layer Separation
43
Flap and Slat Effect on Airflow
Slats do not add camber
44
Leading edge extension
45
Wing tips
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