Stall-Induced Vibrations of the AVATAR Rotor Blade

The Science of Making Torque from Wind

Stettner, M.^1 ; Reijerkerk, M.J.^1 ; Lünenschloß, A.^2 ; Riziotis, V.^3 ; Croce, A.^1 ; Sartori, L.^1 ; Riva, R.^4 ; Peeringa, J.M.^5

GE Global Research, Freisinger Landstrasse 50, Garching

85748, Germany^1

GE Wind Energy GmbH, Holsterfeld 16, Salzbergen

48499, Germany^2

NTUA, P.O. Box 64070, Zografou, Athens

15710, Greece^3

Politecnico di Milano, Via La Masa 34, Milano

20156, Italy^4

ECN, Westerduinweg 3, Petten

1755 LE, Netherlands^5

关键词: Aerodynamic modeling;    Dynamic stalls;    Induced vibrations;    Load components;    Non-linear response;    Operating condition;    Rotor blades;    System identification methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/4/042019/pdf
DOI  :  10.1088/1742-6596/753/4/042019

来源: IOP

【 摘 要 】

In the course of the AVATAR project, partner predictions for key load components in storm/idle conditions separated in two groups. One group showed large loading due to edgewise instability, the other group damped edgewise oscillation and lower load levels. To identify the cause for this separation, the impact of structural and aerodynamic modeling options on damping of stall-induced vibrations is investigated for two simplified operating conditions of a single AVATAR blade. The choice of the dynamic stall model is found to be the primary driver, and is therefore most likely also the reason for previously observed differences in AVATAR storm load predictions. Differences in structural dynamics, mode shapes, structural and dynamic twist, as well as wake model are only secondary in terms of impact on damping. Resolution suffered from failure of system identification methods to extract reliable damping values from various non-linear response simulations.