Development of new tip-loss corrections based on vortex theory and vortex methods

The Science of Making Torque from Wind 2012

Branlard, Emmanuel^1 ; Gaunaa, Mac^1

DTU Wind Energy, Roskilde

4000, Denmark^1

关键词: Analytical formulation;    Blade-element momentums;    Helical vortices;    Numerical formulation;    Tip loss correction;    Vortex methods;    Wake distortion;    Wake expansions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012012/pdf
DOI  :  10.1088/1742-6596/555/1/012012

来源: IOP

【 摘 要 】

A new analytical formulation of the tip-loss factor is established based on helical vortex filament solutions. The derived tip-loss factor can be applied to wind-turbines, propellers or other rotary wings. Similar numerical formulations are used to assess the influence of wake expansion on tip-losses. Theodorsen's theory is successfully applied for the first time to assess the wake expansion behind a wind turbine. The tip-loss corrections obtained are compared with the ones from Prandtl and Glauert and implemented within a new Blade Element Momentum(BEM) code. Wake expansion is seen to reduce tip-losses and have a greater influence than wake distortion.