Fluid-Structure-Characteristics of Flexible Wings for Wind Turbines

与传统的转子叶片概念相比，具有柔性机翼的风力涡轮机转子可以选择性地获得类似的空气动力学性能。在此背景下，本文主要研究气流与膜式升力表面柔性结构之间的相互作用，这种相互作用一方面对升力表面的气动性能有重要影响，另一方面对结构载荷也有重要影响。研究是基于一种具有承重梁结构和柔性翼的机翼构型。柔性翼的自适应特性一方面应该允许理想的目标压力分布和气动性能，另一方面相对于传统结构设计提供更低的结构载荷，同时减少高度不稳定或阵风来流中的峰值载荷。本文的工作重点是研究柔性翼与气流相互作用的高质量数值模拟方法，并通过翼段风洞实验对模拟结果进行验证。未来的目标是展示“FlexWing”应用的可能潜力，并利用这些调查的结果进行可行性和经济研究。

Rotors for wind turbines featuring flexible wings may optionally obtain a similar aerodynamic performance compared to conventional rotor blade concepts. In this context, the present research concentrates on the interaction between air flow and flexible structure of a membrane-type lifting surface, which has a significant influence on the aerodynamic performance on the one hand and on the structural loads on the other hand. The investigations are based on a wing configuration with load-bearing beam structure and flexible wing. The adaption characteristics of the flexible wing should on the one hand allow a desired target pressure distribution and aerodynamic performance, and on the other hand provide lower structural loads relative to conventional structural designs along with a reduction of peak loads in highly unsteady or gusty incoming flow. The focus of the work is on the methods for high-quality numerical simulations of the interaction between the flexible wing and the acting flow and the validation of the simulation results by performing wind tunnel experiments for a wing segment. A future aim is to show the possible potentials of “FlexWing” applications and to exploit the results of these investigations for feasibility and economic studies.