Propeller Blade Section Profile using Wageningen B-screw series

Propeller Blade Section Profile Calculation

Wageningen B-screw series is perhaps the most extensive and widely used propeller series The extent of the series in terms of a blade number versus blade area ratio matrix is shown in table 6.4 from which it may be seen that the series numbers some 20 blade area-blade number configurations. The geometry of the series is shown in Table 6.5 Here Given Data: Blade Number Z = r/R = AE/AO = Diameter = For the value of (r/R)=0.6

3 0.6 0.35 1.2 m

(�.�)/(�. 2.186 ��/��) = Chord Length of the Blade Section, c = 0.30604 m 306.04 mm Calculaion of tmax : For the value of (r/R)=0.6 Ar

Br 0.0278

Here

t(m) a/c b/c a(m) b(m) 0.002 0.02616 0.558 0.389 0.17077 0.11905 170.7703 119.0496 mm

�/�=��−���

Ar Br = Constants in equation for t/D a = Distance between leading edge and generator line at r b = distance between leading edge and location of maximum thickness t= maximum blade secton thickness at radius r c = chord length of the blade section at radius r So tmax =

0.02616 m 26.16 mm

opeller series matrix is shown e area-blade

Here tmax =

26.16 mm

tt.e. =

here tt.e. = .02xtmax

0.5232 mm

tl.e. =

0

Blade Section Profile At r/R = 0.6 V1

P

V2

Yface=V1(tmax-tt.e.) For P≤0Yback=(V1+V2)*(tmax-tt.e.)+tt

Yface=V1(tmax-tl.e.) For P≥0Yback=(V1+V2)*(tmax-tl.e.)+tl.

-1 -0.95 -0.9 -0.8 -0.7 -0.6 -0.5 -0.4

0 0 0 0 0 0 0 0

0 0.0965 0.1885 0.3585 0.511 0.6415 0.753 0.8426

0 0 0 0 0 0 0 0

-0.2 0 0.2 0.4 0.5 0.6 0.7 0.8

0 0 0 0 0 0 0 0.0006

0.9613 1 0.969 0.879 0.809 0.72 0.606 0.462

0 0 0 0 0 0 0 15.696

0.85 0.9 0.95 1

0.0022 0.0067 0.0169 0.0382

0.3775 0.272 0.1485 0

57.552 175.272 442.104 999.312

2 5 9 13 16 19 221

251

1

t r/R = 0.6

back

=(V1+V2)*(tmax-tt.e.)+tt.e. For P≤0

back

=(V1+V2)*(tmax-tl.e.)+tl.e. For P≥0 523.2 2997.1512 5355.7368 9713.9928 13623.6048 16969.2072 19827.7104 22124.76768 25167.85584 26160 25349.04 22994.64 21163.44 18835.2 15852.96 12101.616 9932.952 7290.792 4326.864 999.312