The developed optimization process projects decreased blade loads while maintaining wind turbine performance.
Meanwhile, the strength of leakage flow is also suppressed in the forward swept rotor SF because of the decreased blade loading near leading edge in tip region.
It is concluded that the stall is postponed due to rotation and the separation point is delayed as a result of increasing rotation speed or decreasing blade spanwise position.
The simulation results show in Class IIB winds that the two-bladed downwind pre-aligned rotor with 15° coning, decreases the blade damage equivalent loads by 19.0%, and decreases rotor blade mass by 27.4%, compared with the unmodified conventional upwind three-bladed rotor.
As the X-ray pulse width decreases the fan blade sharpness increases evidencing the usefulness of beam pulsing in acquiring high resolution images in moving systems.
However, the results reveal that the 3 bladed rotor displayed maximum hydrodynamic performance as a rigid structure which then decreased as the blade deformed.
In addition, due to the low rotating speed, the requirement for structural strength decreases, thus the blade thickness can be reduced, further effectively reducing the engine's weight.
From flowing field analysis, it is found that the effective concave winding area of the blade decreases due to the shading of the nearby blade for the three-blade Savonius turbine, while the effective convex winding area of the blade increases due to the addition of the other blade, which results in the lower power efficiency of three-blade Savonius turbine [5].
Inversely, the mean-square response increases when the high natural frequency of base (natural frequencies of base are over the first natural frequency of blade) decreases.
Subsequently, starting at about 22 hAPF, cell elongation decreases although the blade continues to elongate.
