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Modern Windships; Phase 2

 

 

Table 31. Scaling the lift coefficient linearly with the depth of the profile
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