WW97-155/142 Airfoils
WW97-155/142 Airfoils
WW97-155/142 Airfoils
W.Würz
Motivation, Zielsetzung
Re=2.5*106
1.2
1.0
15
0.8
1240Hz
N
1840Hz
0.6 2440Hz
10
3040Hz
0.4 3640Hz
5
0.2
0.0 0
0.0 0.2 0.4 0.6 0.8 s/smax 1.0
-1.0
B-Maximum
-1.5 3%
A-Maximum
1%
-2.0
A/A0=1800 ln(A/A0)=7.5
-2.5
0.1%
-3.0
-3.5
-4.5
-5.0
0.2 0.3 0.4 0.5 0.6 0.7
S/Smax
Berechnung laminarer Ablöseblasen:
iteratives Quell-Senkenverfahren u/u-ab Van Ingen
Vorgabe: 1.0
Potentialgeschwindigkeitsvert.
empirische U-Vert. Blase
Ergebnis:
Verdrängungsdicke 0.6
Impulsverlustdicke 0.0 0.2 xsi 0.4
y/t u/U
8
0.25 u ≈ xm 1.4
1.2
0.20
1.0
0.15
δ1*10
0.8
Profilkontur
0.10
δ2*10 0.6
0.05
0.40 0.50 0.60 0.70 x/t 0.80
1.0 1.0
0.8 0.8
laminare turbulentes
0.6 0.6 Ablösung Anlegen
0.4 0.4
0.2 0.2
0.0 0.0
0 20 40 60 80 x/t100 0 20 40 60 80 x/t 100
1.2 30 kg/m 2
Ca Re-Zahl
1.0
2.5
0.8 2
1.5
0.6 1
0.7
0.4
0.5
0.2
0.0
0 1 2 3 4 5 6 b [m] 7
0.2
0.0
0 1 2 3 4 5 6 b [m] 7
Discus
1.5 Ca 1.5
Ca
0.3 0.3
U/U 0.7 U/U
8
0.7
8
1.1 1.1
1.0 1.0
0.5 0.5
WW97-155 WW97-142
0.0 0.0
0.0 0.2 0.4 0.6 0.8 x/t 1.0 0.0 0.2 0.4 0.6 0.8 x/t 1.0
delta-Cw
WW97155 - WW97142 30 kg/m2 0.001
1.2
Ca 0.0008
1.0 0.0006
0.0004
0.8
0.0002
0
0.6
-0.0002
0.4 -0.0004
-0.0006
0.2 -0.0008
-0.001
0.0
0 1 2 3 4 5 6 b [m] 7
50 kg/m2 delta-Cw
1.2
Ca 0.001
1.0 0.0008
0.0006
0.8 0.0004
0.0002
0.6
0
0.4 -0.0002
-0.0004
0.2 -0.0006
-0.0008
0.0
0 1 2 3 4 5 6 b [m] 7 -0.001
Discus
Widerstandsbilanz am Flügel (30kg/m )2
1.2
WW97-155
WW97-142
Ca
1.0
Cw-Profil Cw-induz.
0.8
0.6
0.2
0.0
0.000 0.005 0.010 0.015 0.020 0.025 Cw 0.030
Re-Zahl Discus 30kg/m2
Schräglage 0.5 0.7 1 1.5 2 2.5
Ca-quer=1.
80 80
Phi [grd] Phi
70 70
60 60
50 50
40 40
30 30
20 20
10 10
0 0
-5 0 5 b [m] 0 50 100 150 200 250
Innenflügel Spannweite r [m]
Kreisradius
Discus 30kg/m2
Ca -lokal
Ca-quer=1.
Schräglage 0.75 0.85 0.95 1.05 1.15 1.25 Querruder-Diff. 2:1
80 80
Phi [grd] Phi
70 70
60 60
50 50
40 40
30 30
20 20
10 10
0 0
-5 0 5 b [m] 0 50 100 150 200 250
Innenflügel Spannweite r [m]
Kreisradius
Zacken, h=0.5mm, 60grd, Vorderkante 77% Noppen, h=0.9mm, 16mmAbst., Mitte77%