Post on 26-Sep-2015
description
transcript
Cord
Middle line
http://www.pagendarm.de/trapp/programming/java/profiles/NACA4.html
a
Angle of attack
Velocity
c
Lift
FL
Drag
FD
Pressure distribution around an airfoil
http://www.desktopaero.com/appliedaero/
0
-
+
DH
Pressure along the upper surface
Pressure along the lower surface
Lift
Lift
FL
Lift coefficient
CL
FL
Drag
Drag
FD
Drag coefficient
CD
FD
Blade profile data
Angle of attack
Average relative
velocity
d
v
Angle of attack
Peripheral velocity =
U
w
U
C
Wind velocity = C
Relative velocity = V
V
U
V
C
FL
FD
Torque
Trust
U
V
C
Torque
Trust
U
V
C
Torque
Trust
Torque
Trust
Fthrust
Mthrust
C
Fthrust
Mtorque
w
R
U
w
=
Depth
h
Cordelengt
C
2
c
F
L
2
L
r
=
Depth
h
Cordelengt
C
2
c
F
L
2
L
r
=
Depth
h
Cordelengt
C
2
c
F
D
2
D
r
=
Depth
h
Cordelengt
C
2
c
F
D
2
D
r
=
L
D
C
C