D1 = 2.2*0.5*1.25*252*141.1 = 121.3 kN
D2 = 0.14*0.5*1.25*252*344.8 = 18.6kN
D3 = 1.4*0.5*1.25*252*451.1 = 246.7kN
Clav = 3.27
Cdav = 1.2
Sum: 386.6kN
CNav = -0.167
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Modern Windships; Phase 2 |
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| Table 31. Scaling the lift coefficient
linearly with the depth of the profile |
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| Profile no | Profile depth in percent of chord [%] | Scaling Cl linearly with profile curvature | Distributing the lift force as a linear function of Cl and profile area | Scaling Cd with the square of the estimated Cl | Estimating CN from the estimated Cl.-CN relationsip |
| 1 | 7.3 | Cl1 = 7.3 / 4.93*3.2 = 4.74 | |
Cd1 = (4.74/3.2)2 * 1.03 =
2.2 D1 = 2.2*0.5*1.25*252*141.1 = 121.3 kN |
CN1 = 0.0774 -0.07732 * 4.74 = -0.289 |
| 2 | 1.8 | Cl2 = 1.8 / 4.93*3.2 = 1.17 | |
Cd2 = (1.17/3.2)2 1.03 = 0.14 D2 = 0.14*0.5*1.25*252*344.8 = 18.6kN |
CN2 = 0.0774 -0.07732 * 1.17 = -0.013 |
| 3 | 5.7 | Cl3 = 5.7 / 4.93*3.2 = 3.7 | |
Cd3 = (3.7/3.2)2 1.03 = 1.4 D3 = 1.4*0.5*1.25*252*451.1 = 246.7kN |
CN3 = 0.0774 -0.07732 * 3.7 = -0.209 |
| All, sum or average value | Average: 4.93 | Area based average: Clav = 3.27 |
Sum:1.07 MN. | Area based average: Cdav = 1.2 Sum: 386.6kN |
Area based average: CNav = -0.167 |