ScholarWorks@경상국립대학교

초록

Accurate prediction of design load cases for large wind turbines is crucial in the practical design process to minimize weight and ensure structural safety. This study examines the characteristics and potential discrepancies of different numerical analysis methods under rapidly varying wind environments, such as the extreme coherent gust (ECG) load case. Both the traditional Blade Element Momentum (BEM) theory and an advanced numerical method based on Computational Fluid Dynamics (CFD), coupled with Multi-Body Dynamics (MBD) load analysis, are employed to analyze the ECG condition. In the CFD-based approach, a full-configuration wind turbine model, including the rotor, hub, nacelle, and tower, was analyzed to achieve high-fidelity predictions while incorporating wind conditions that vary over time. Computational analyses using these different methods were performed and compared for a 5 MW wind turbine model. A wind-profile generation code for the ECG condition was developed and implemented in accordance with the GL Guideline. The results show that the different approaches generally agree well in normal wind conditions; however, somewhat different results were observed in the ECG condition.

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