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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
energy
On the dependence of an empty flanged diffuser performance on flange height: Numerical simulations and PIV visualizations
Renewable Energy, Volume 56, Year 2013
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Description
Flanged diffuser shrouding small wind turbine, is among the most tested devices for increasing wind energy. The height of the flange is between the geometric futures of the diffuser that contributes efficiently in improving diffuser performances. Results obtained from numerical simulations and PIV visualizations show that when a flange is mounted at the outlet area of the diffuser, two contra-rotating vortices were created at this location. These two vortices move away from each other in the flow direction as the flange height increases and they seem to lengthen in the streamwise direction and to extend in the two directions when the flange height becomes taller. A critical ratio (Flange height/Inlet section diffuser diameter = 0.1) has been found. Beyond this value, due to the remoteness of vortices from the flange, the flange height seems to be without significant effect on increasing wind velocity. © 2012 Elsevier Ltd.
Authors & Co-Authors
Kardous, M.
Tunisia, Hamam Lif
Centre de Recherches et Des Technologies de L'energie
Chaker, Rym
Tunisia, Hamam Lif
Centre de Recherches et Des Technologies de L'energie
Aloui, Fethi
Tunisia, Hamam Lif
Centre de Recherches et Des Technologies de L'energie
Ben Nasrallah, Sassi
Tunisia, Monastir
Ecole Nationale D'ingenieurs de Monastir
Statistics
Citations: 37
Authors: 4
Affiliations: 2
Identifiers
Doi:
10.1016/j.renene.2012.09.061
ISSN:
09601481