Axial Gap Optimisation of Half Diameter Shifted Counter Rotating Dual Rotor Wind Turbine

• Main Authors: Csaba Hetyei, Ferenc Szlivka
• Format: Article
• Language: English
• Published: Croatian Interdisciplinary Society 2020-10-01
• Series: Interdisciplinary Description of Complex Systems
• Subjects: cfd; co-drwt; optimisation; smart grid; wind turbine for urban areas
• Online Access: http://indecs.eu/2020/indecs2020-pp389-399.pdf

General energy demand is continuously increasing due to the fact that wind turbines and other renewable energy sources have begun to appear in previously unexplored areas, such as on the roofs of buildings. In view of this demand, a new type of wind turbines described in this article could become one of the energy generating tools in a smart grid system. In this article, first conventional and unconventional wind turbines are reviewed with respect to efficiency. Then a Counter Rotating Dual Rotor Wind Turbine (CO-DRWT) construction is analysed with Computational Fluid Dynamics (CFD) codes considering a fixed radial and a variable axial distance. In the analysis, power coefficients were calculated for different configurations. It was found that in case of the dual rotor wind turbine, the optimal axial distance for half diameter radial shift was in the range of 0,2 - 0,25 diameter.