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The need for usage of renewable resources is growing since fossil fuels had already been depleted and they will last only for few years to come. Wind energy is one form of renewable energy and it can be harnessed by means of wind turbines. The improvements in design of wind turbines are continuously increasing and still a lot has to be made. The ma...
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Citations
... Excess capacity, geographically dispersed turbines, dispatchable resources, ample hydroelectric power, importing and exporting energy to surrounding communities, energy storage, or lowering production when wind output is low can all help solve these problems in many cases. 7 The Betz limit defines the maximum theoretical power coefficient corresponding to the maximum efficiency for wind turbines. A number of studies have indicated that enclosing the turbine with a shroud or duct might help overcome the Betz limit and reduce some of the losses related to tip vortices. ...
This work presents an approach to the analysis of duct-augmented wind turbines using Computational Fluid Dynamics (CFD). The main objective is to find the optimum duct shape and design that gives maximum boost to the performance of wind turbines. A duct surrounding the rotor is able to increase the power coefficient above the Betz limit, so it has attracted great attention for many years. In this work, an extensive analysis of the performance of duct augmented wind turbines is presented, considering the influence of various duct angles and axial holes in the diffuser on the efficiency, in which a new formulation for the far-wake velocity is proposed. This study consists of two main parts. The first part compares the experimental performance of a conventional wind turbine with the identical turbine modeled and solved using CFD. Once the CFD results are validated, the second part presents an extensive parametric study by integrating a convergent duct with different parametric designs into the wind turbine model. The study reveals that the CFD results are in close agreement with the experimental results. It is found that the presence of holes in the duct has a detrimental effect on performance. However, the increase in the angle of the duct enhanced the performance, and there was an average increase in power output by 96% with a duct angle of 20°.
