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Zhou J.,CAS Institute of Engineering Thermophysics | Zhou J.,University of Chinese Academy of Sciences | Yang K.,CAS Institute of Engineering Thermophysics | Yang K.,Chinese Academy of Sciences | And 6 more authors.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2013

Simulation of the flow field around the DU93-W-210 Airfoil shows that the laminar bubbles attached on the airfoil have an important impact on the development and evolution of the flow field. These bubbles, where the vortex structure grows and turbulent fluctuation increases, enhance the flow instability. The impact of the bubbles is quite small with small angle of attack. When the angle of attack increases, the size and location of the bubbles play a great role on the flow field. Especially, the appearance of the laminar bubbles on leading edge makes the flow field unstable, accelerates the flow separation progress and contributes to the generation of airfoil stall. Source

Zhang L.,CAS Institute of Engineering Thermophysics | Zhang L.,Chinese Academy of Sciences | Zhang L.,Engineering Research Center on Wind Turbine Blade of Hebei Province | Yang K.,CAS Institute of Engineering Thermophysics | And 5 more authors.
Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | Year: 2014

It's important of blade weight for the structure performance as the blade become long and flexible for large wind turbines. The designers should reduce the mass of blade to alleviate the impact to structure due to weight loads, while they should also keep the aerodynamic performance efficient enough. The influence of chord and thickness (absolute or relative) on blade weight was investigated in this paper, based on a simplified mass model in which the flapwise stiffness was fixed by changing lamination of spar while other laminations are the same with original blade. The results show that increasing the thickness of blade is beneficial to reduce blade weight. The best way is to increasing the relative thickness at the range of 20% to 80% span-length. However, the aerodynamic performance, power coefficient, decreased when the stiffness was fixed at a design considering the interaction between aerodynamic and gravity. Source

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