Designing and Analyzing three-Blade Vertical Axis Wind Turbine Stress under Dynamic Loading

Clean and renewable energies have encouraged the engineers to try to meet the needs and problems of today’s world, among which wind energy is the most important one. In this course, innovation in designing and updating and improving the function of wind turbines as the best known energy convertor has been the subject of many industrial and academic studies in recent decades. The wind turbine designed in this article is of vertical axis type which has less been addressed in literature in which the moving shaft is perpendicular to the ground. As the demands of the designing, this turbine rotates with the constant rotation speed of 165 rpm and its nominal power is 3kw. Three blades with constant profile are considered for this wind turbine and two holding strut connectors are designed for each blade. Among the most important parts of the design are tubular shaft connected to the strut connectors besides to the main shaft to keep the turbine between the bearing, sprocket wheel to convert the speed ratio and finally the mechanical brake to control the speed. The turbine’s tower is designed, according to the geographical conditions of the area, and installed and started in the given height and the dynamic analysis is conducted according to the obtained forces. In this paper, different stages of designing the turbine parts referred here are presented based on the above analyses. At the end, fatigue analysis and determining the stress exerted on some of this wind turbine parts are presented.