Flow interaction of diffuser augmented wind turbines

The Science of Making Torque from Wind

Göltenbott, U.^1 ; Ohya, Y.^2 ; Yoshida, S.^2 ; Jamieson, P.^3

Department of Aeronautics and Astronautics, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka

819-0395, Japan^1

Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasuga-koen, Kasuga

816-8580, Japan^2

Wind Energy DCT, University of Strathclyde, Royal Collage R336, Glasgow

G1 1XW, United Kingdom^3

关键词: Cost of energies;    Multi-rotor system;    Physical dynamics;    Power increase;    Small wind turbine;    Stand -alone;    Uniform flow;    Wind tunnel experiment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/2/022038/pdf
DOI  :  10.1088/1742-6596/753/2/022038

来源: IOP

【 摘 要 】

Up-scaling of wind turbines has been a major trend in order to reduce the cost of energy generation from the wind. Recent studies however show that for a given technology, the cost always rises with upscaling, notably due to the increased mass of the system. To reach capacities beyond 10 MW, multi-rotor systems (MRS) have promising advantages. On the other hand, diffuser augmented wind turbines (DAWTs) can significantly increase the performance of the rotor. Up to now, diffuser augmentation has only been applied to single small wind turbines. In the present research, DAWTs are used in a multi-rotor system. In wind tunnel experiments, the aerodynamics of two and three DAWTs, spaced in close vicinity in the same plane normal to a uniform flow, have been analysed. Power increases of up to 5% and 9% for the two and three rotor configurations are respectively achieved in comparison to a stand-alone turbine. The physical dynamics of the flows are analysed on the basis of the results obtained with a stand-alone turbine.