Numerical verification of a new load alleviation technique for wind turbines in atmospheric turbulence

大气湍流中风力发电机减载新技术的数值验证

• 批准号: 218741182
• 负责人: Dr.-Ing. Thorsten Lutz
• 金额: --
• 依托单位: Institut für Aerodynamik und Gasdynamik (IAG)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/218741182?language=en
• 关键词: Numerical; verification; new; load; alleviation

The common purpose of the research focus is the improvement of calculation methods for wind turbines in turbulent atmospheric inflow, the investigation of the occurring complex interactions and load cycles, the experimental and numerical study of a novel load alleviation concept and its influence of the aerodynamics of the turbine, the loads and the wake.The first main objective in the proposed prolongation phase (36 months) for the present sub-project is the extension of the numerical setup and process chain for CFD simulations of wind turbines with kinematically coupled leading and trailing edge flaps under turbulent inflow conditions. This will be done by implementing a fluid-structure coupling to determine the transient flap deflection, considering all acting forces, instead of prescribing them, as it was done up to now. The CFD code (FLOWer) will determine the unsteady aerodynamic forces and moments on the flaps and pass them to the CSD code (SIMPACK). There, the inertias and the weight forces will be calculated and the flap deflection will be determined. This will be done in a time-accurate manner for every physical time-step considered in the unsteady CFD simulation. To evaluate the load control concept under investigation and to study the occurring aerodynamic effects, the complexity of the system will be increased successively (starting from a 2D airfoil with leading edge and trailing edge flaps at steady inflow up to a full size wind turbine under turbulent atmospheric inflow conditions). The unsteady flap deflections will be calculated directly in all simulations. The extended process chain is verified by comparison with experimental data from two wind tunnel campaigns of profiles with load control concept and with wind tunnel data of a model rotor with load control. The validated code is then used to simulate the generic NREL 5MW wind turbine.The second main objective is the investigation of the influence of flaps for a turbine at non rated conditions. These operating conditions cause deterministic load fluctuations combined with unsteady aerodynamic effects, which were not investigated in the first two project phases but have a significant impact on the life time of a wind turbine. Therefore, they are an important element in the evaluation of the effectiveness of the load control. The studies of these cases lead to an extension of the scope of investigated load cases and to a more realistic view on the overall loads over the life time of a wind turbine.The new objectives can only be achieved thanks to investigations and code extensions done in the first two project phases. Moreover, the simulations performed during this time can now be used for comparative purposes. For the validation of the new extensions, wind tunnel measurement are necessary again and therefore, the close link between experiment and simulation will continue to exist.

研究的共同目的是改进紊流大气入流中风力机的计算方法，研究发生的复杂相互作用和负荷循环，实验和数值研究一种新的负荷减轻概念及其对风力机、负荷和尾迹空气动力学的影响。本子项目延长阶段（36个月）的第一个主要目标是扩展湍流流入条件下具有运动耦合前后缘襟翼的风力涡轮机的CFD模拟的数值设置和过程链。这将通过实现流固耦合来确定瞬态襟翼挠度，考虑所有的作用力，而不是像现在这样规定它们。CFD代码（FLOWer）将确定襟翼上的非定常气动力和力矩，并将其传递给CSD代码（SIMPACK）。在那里，惯量和重力将被计算和皮瓣挠度将被确定。对于非定常CFD模拟中考虑的每个物理时间步，这将以时间精确的方式完成。为了评估所研究的负载控制概念并研究发生的气动效应，系统的复杂性将依次增加（从稳定流入时前缘和后缘襟翼的二维翼型到湍流大气流入条件下的全尺寸风力机）。在所有的模拟中，襟翼的非定常偏转都是直接计算的。通过与带负荷控制概念的型材风洞试验数据和带负荷控制的模型转子风洞数据的对比，验证了扩展过程链的正确性。然后将验证后的代码用于模拟通用NREL 5MW风力涡轮机。第二个主要目标是研究在非额定条件下襟翼对涡轮的影响。这些运行条件会导致确定性的负载波动以及非定常气动效应，这些在前两个项目阶段没有进行研究，但对风力机的寿命有重大影响。因此，它们是评价负荷控制效果的重要因素。对这些案例的研究扩大了研究负载案例的范围，并对风力涡轮机寿命期间的总体负载有了更现实的看法。只有在项目的前两个阶段进行调查和代码扩展，新的目标才能实现。此外，在此期间进行的模拟现在可以用于比较目的。为了验证新的扩展，风洞测量是必要的，因此，实验和模拟之间的密切联系将继续存在。

项目成果

About the Influence of Wind Tunnel Walls, Tower and Nozzle on the Performance of a Model Wind Turbine

关于风洞墙、塔架和喷嘴对模型风力发电机性能的影响

• DOI: 10.1007/978-3-319-68394-2_20
• 发表时间: 2018
• 作者: Krämer

Numerical and experimental investigation of an airfoil with load control in the wake of an active grid

主动网格后带有负载控制的翼型的数值和实验研究

• DOI: 10.1088/1742-6596/753/2/022036
• 发表时间: 2016
• 作者: Fischer;Lutz T;Krämer E;Cordes;Hufnagel K;Tropea C;Kampers G;Hölling;Peinke
• 通讯作者: Peinke

Simulations of Unsteady Aerodynamic Effects on Innovative Wind Turbine Concepts

创新风力涡轮机概念的非定常空气动力效应模拟

• DOI: 10.1007/978-3-319-47066-5_36
• 发表时间: 2016
• 作者: Fischer;Krämer
• 通讯作者: Krämer

Numerical Investigation of a Model Wind Turbine

模型风力发电机的数值研究

• DOI: 10.1007/978-3-319-64519-3_64
• 发表时间: 2018
• 作者: Fischer;Krämer
• 通讯作者: Krämer

Cross-Talk Compensation for Blade Root Flap- and Edgewise Moments on an Experimental Research Wind Turbine and Comparison to Numerical Results

实验研究风力涡轮机叶片根部襟翼和边缘力矩的串扰补偿以及与数值结果的比较

• DOI: 10.1115/gt2018-76977
• 期刊: Volume 9: Oil and Gas Applications; Supercritical CO2 Power Cycles; Wind Energy
• 作者: Batholomay;Marten;Sánchez Martínez;Pechlivanoglou;Nayeri;Paschereit;Krämer
• 通讯作者: Krämer