An investigation of the Steady-State and Fatigue Problems of a Small Wind Turbine Blade Based on the Interactive Design Approach

A wind turbine blade is an essential system of energy production. During the operation blade, it subjected to loads resulting from impact on surface blade. This leads appear large deflections and high fatigue stresses in structure blades. In this paper, a 5 kW horizontal axis model designed optimized using new MATLAB code based element momentum (BEM) theory.The aerodynamic shape has been improved compared with initial design, power increased by 7% coefficient 8%. The finite Element Method was used calculate applied Computational Fluid Dynamics (CFD) BEM theory.High agreements were obtained between results both approaches (CFD BEM).The ANSYS software also simulate optimize applying variable static 3.3, 6, 8.3 kg experimental results. It reduced maximum deflectionswith 37%, 42.85%, 42.61% when CFRP material 4.5%, 15.45%, 16.19% for GFRP that corresponds forces. Based results, mass decreased 47.86% 71.24% CFRP. IEC 61400.2 standard estimate thefatigue loads, damage, life prediction, verify safety usinga Simplified Load Model(SLM) FAST software. found will be safe under extreme lifetime (GFRP) 5.5 years 10.25 years,according SLM software, respectively. At same time, (CFRP)is more than 20 years, according two methods.