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Zhang Z.-Y.,Jiangsu Key Laboratory of Hi Technology Research for Wind Turbine Design | Wang T.-G.,Jiangsu Key Laboratory of Hi Technology Research for Wind Turbine Design | Chen L.,China Aerodynamics Research And Development Center | Xu B.-F.,Jiangsu Key Laboratory of Hi Technology Research for Wind Turbine Design | And 2 more authors.
Kongqi Donglixue Xuebao/Acta Aerodynamica Sinica | Year: 2013

The aerodynamic characteristics of a conceptual horizontal-axis wind turbine blade with multiple winglets were numerically investigated by computational fluid dynamics (CFD) methods and were validated with the free vortex wake method. With the prototype of NREL phase VI blade, the interaction between the reasonably designed winglets and the improvements of integrated performance were discussed. The results from both CFD and free vortex wake simulations indicated that, with the current design, multiple tip vortex structures were formed from the winglets. The multiple vortices produce additional suction near the leading edges, which promises the improvements of total functioning of the blades at medium and high speeds. Meanwhile, the single tip vortex from the original design was distributed. The streamwise vorticity and then the induction influence was alleviated. Based upon the above work, the key geometrical parameters were optimized by a genetic algorithm code for multiple objectives. A set of optimum designs with high energy conversion efficiency were obtained.


Li H.,Jiangsu Key Laboratory of Hi Technology Research for Wind Turbine Design | Wang T.,Jiangsu Key Laboratory of Hi Technology Research for Wind Turbine Design
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2013

Based on the FEM model of composite wind turbine blade, a novel loading-distributed force function was proposed. The flapwise concentrated force and edgewise concentrated force on the blade sections were transferred to the distributed forces along the span, and concentration load on the chord were also transferred to the distributed force by considering the pressure distribution over the airfoil. Both of the distributed forces on the blade span and section chord were applied on the outline of the FEM model. The deflection, strength and stability of the blade due to the distributed forces were analyzed and compared with the results from traditional multi-point constraint concentration loading by the FEM computation, demonstrating that this novel loading way can make a better match of practical load-carrying capability in terms of structural property. It provides an efficient way for blade structural design and check.

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