静水压作用下的潮流能发电机叶片疲劳分析

The design load series which exported from commercial software GH Tidal Bladed are used for structure analysis of tidal current turbine blade in current state. In order to evaluate the fatigue damage of tidal current turbine blade under hydrostatic pressure, a method combine effects of hydrodynamic and hydrostatic loads using equivalent method, based on GL 2010 certification guideline, is presented. Firstly, the damage accumulation of hydrodynamic loads and consequent equivalent constant-range spectra are calculated. Secondly, finite element analyses are applied on the blade under cycled hydrostatic loads, and then cycled stresses under cycled loads at the hotspots are extracted as constant-range spectra for hydrostatic loads. Then, two parts of equivalent spectra are combined to get full equivalent spectra. For example, a fatigue analysis is applied on a 300 kW single tidal current turbine blade. The results show that hydrostatic pressures objectively increase the damage accumulation. The method present gives a practical evaluation for fatigue analysis of tidal current turbine blade under hydrostatic pressures.