A Damping Blade for Wind Turbine and its Flutter Suppressing Analysis

Abstract

Blade flutter of wind turbine causes serious problems so as to hinder wind capture and utilization to a large extent. To cope with the problem and promote the flutter self-suppressing capability, a damping blade with high damping characteristic is proposed. The damping blade is mainly comprised of the girder and the panel which are respectively treated through the method of free damping layer and co-curing constrained damping layer. At the same time, its parameter identification including thickness of damping layer and structural loss factor is derived theoretically. For validation and evaluation of flutter suppression effect, dynamic model considering the aerodynamic and structural factors is established, and numerical simulation is carried out. The results indicate that the proposed damping blade displays outstanding flutter self-suppressing capability in contrast to the conventional blade. Recent patents on the blade flutter suppressing for wind turbine are also addressed. Keywords: Aerodynamic model, blade, damping structure, flutter suppressing, loss factor, stability analysis, wind turbine.