Fig. 1 Simplified block diagram of the BEM method Simplified block diagram of the BEM method More

Fig. 2 Rotor blade and wake [ 30 , 28 ] Rotor blade and wake [30,28] More

Fig. 3 Vortex filament [ 29 ] Vortex filament [29] More

Fig. 4 Vector diagram used for the Biot–Savart law [ 30 ] Vector diagram used for the Biot–Savart law [30] More

Fig. 5 Strip geometry definitions [ 30 ] Strip geometry definitions [30] More

Fig. 6 Diagram for angles and velocities of the airfoil section of the blade Diagram for angles and velocities of the airfoil section of the blade More

Fig. 7 Flowchart of the calculation procedure Flowchart of the calculation procedure More

Fig. 8 Variation of power with wind speed of the BEM and the lifting line predictions with the results of Liu et al. [ 33 ] Variation of power with wind speed of the BEM and the lifting line predictions with the results of Liu et al. [33] More

Fig. 9 Variation of error from the proposed numerical codes relative to Ref. [ 33 ] with wind speed Variation of error from the proposed numerical codes relative to Ref. [33] with wind speed More

Fig. 10 Comparison of the predicted power coefficient from the BEM and lifting line with the experimental results from Ref. [ 34 ] Comparison of the predicted power coefficient from the BEM and lifting line with the experimental results from Ref. [34] More

Fig. 11 Comparison of the predicted power from the BEM and lifting line with the experimental results from Ref. [ 34 ] Comparison of the predicted power from the BEM and lifting line with the experimental results from Ref. [34] More

Fig. 12 Estimated deviations of the BEM and lifting line predictions from the experimental results of Ref. [ 34 ] Estimated deviations of the BEM and lifting line predictions from the experimental results of Ref. [34] More

Fig. 13 The chord and twist angle distributions of the rotor from Ref. [ 36 ] The chord and twist angle distributions of the rotor from Ref. [36] More

Fig. 14 Comparison between the predicted results and those from Ref. [ 36 ] Comparison between the predicted results and those from Ref. [36] More

Fig. 15 Comparison of the predicted power coefficient with experimental results Comparison of the predicted power coefficient with experimental results More

Fig. 16 Effects of wind speed on generated power and power coefficient for the combination of linear chord and linear twist angle distributions for the Gottingen GO 398 airfoil Effects of wind speed on generated power and power coefficient for the combination of linear chord and linear twist ang... More

Fig. 17 Effects of wind speed on generated power and power coefficient for the combination of constant chord and linear twist angle distributions using the Gottingen GO 398 airfoil Effects of wind speed on generated power and power coefficient for the combination of constant chord and linear twi... More

Fig. 18 Effects of wind speed on generated power and power coefficient for the combination of linear chord and constant twist angle distributions using the Gottingen GO 398 airfoil Effects of wind speed on generated power and power coefficient for the combination of linear chord and constant twi... More

Fig. 19 Effects of wind speed on generated power and power coefficient for the combination of constant chord and constant twist angle distributions using the Gottingen GO 398 airfoil Effects of wind speed on generated power and power coefficient for the combination of constant chord and constant... More

Fig. 20 Effects of wind speed on generated power and power coefficient for the combination of linear chord and linear twist angle distributions using the Joukowski J 0021 airfoil Effects of wind speed on generated power and power coefficient for the combination of linear chord and linear twist a... More