الفهرس 
TURBULENT FLOW MODELSOnly 14 pages are availabe for public view
Abstract
The current study experimentally and numerically investigates the effect of the wake interaction among multi turbines of straight bladed Darrieus vertical axis wind turbines. The experimental study was conducted using a wind tunnel with an open test section. The uniformity of the wind tunnel was studied and enhanced to give a better face velocity distribution. The numerical study was conducted using a commercial ANSYS CFD software. The experimental results of two test cases, from the literature and from the current experimental study, were used to validate the CFD software. The simulation results, obtained by the CFD software, were found to be in good agreement with the experimental results. Three typical five bladed turbines were used in this study. Various two turbine and three turbine configurations were examined experimentally and numerically to reach the optimum configuration in terms of power coefficient. The results showed that in two turbine arrangement, the co-rotation configuration was better than any of the counter-rotation configurations in terms of power coefficient and the closer the gap between turbines, the better the performance in terms of power coefficient, while the aligned configuration appeared to be the best in terms of power coefficient, rather than any of the staggered configurations. In three turbine arrangement, it was found that the co-rotation configuration was better than the counter-rotation configuration in terms of power coefficient, while the aligned configuration was better than any of the triangle shaped configurations in terms of power coefficient.
Key Words:
Vertical axis wind turbine, Darrieus straight bladed wind turbine, wind energy, wind tunnel, efficiency, power coefficient, tip speed ratio, CFD simulation, turbulence model