Al-Qadisiyah Journal for Engineering Sciences

Abstract The aim of this research is studying the effect of the fibers orientation on the reinforced aluminum specimens. The fibers are made of uniform carboin (0-90) of a volumetric fraction equal to 0.8%. This is for all the reinforcement fiber orientations, using Sikadur -300 resin as connection stuff. Three fiber orientations reinforcements have been used. These orientations are: circular, longitudinal and helical. Then twisting test has been carried out for all the specimens. The test proved that the circular reinforcement improves twisting property, and the helical orientation gives less improvement, while the longitudinal one gives no improvement in the twisting property.

Abstract In this research , the dynamics of the wind energy conversion system of a small wind turbine is studied. The aerodynamic forces are estimated at any incoming wind speeds for turbine blade which is known as airfoil section (NACA4412). The scheme is simulated by a program of Fortran90 and results are presented . The torque and the productive power are estimated from this program at each incoming wind speed, these results are compared with the extraction power from Betz theorem . Also, the number of revs of the small turbine are estimated at each incoming wind speed. From this model, we can specified the determinism of tip speed ratio and wind speed are a more suiting . Because wind speed increase over the suitable value, causes increasing of vortices of the hub and the tip and other losses . The proposed model can further investigate for analysis, design and performance evaluation of remote and off-grid wind energy conversion systems in hybrid applications. Keywords: Wind energy, Renewable energy, Aerodynamics, Small Wind turbine, (CST), Torque ,The Productive Power ,The Blade design and TSR.