Laboratory model of wind turbine blade fitting mechanism to test various blades

摘要

In this invention two blade fitting mechanism are developed. In these mechanisms various types of blades can be fitted. The pitch angle of the blade can also be varied.In the first mechanism, cylinders are welded to the hub. Another cylinder with small diameters is welded to a metallic square strip, which is welded to the blade with one square plate. This small cylinder is concentric to the cylinder which is welded to the hub. Blade can be fixed to the small cylinder using nut and bolt arrangement. The blade can be changed. The blade of desired shape can be fixed to the cylinder. The pitch angle of the blade can be changed by rotating the concentric cylinder. The holes are drilled along the length of both the cylinders. The holes are also drilled along the periphery of the cylinder. The pitch angle can be fixed by nut and bolts passing through the holes of the cylinders.In the second mechanism three brackets are mounted on to the hub using nut and bolt, they can be adjusted according to the required pitch angle. The blades will be then connected to the bracketsusing 2 nuts and 2 bolts, which will be fixed throughout the experimentation. The pitch angle for all three blades is kept constant. This mechanism can be placed in the laboratory test setup. Artificial wind can be created using the blower fans. The impact of blade shape and pitch angle on the output voltage flicker can be observed on digital storage oscilloscope.