EXPERIMENTAL AND NUMERICAL STUDY OF DIFFUSER AUGMENTED WIND TURBINE - DAWT
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abstract
In this work was studied the effect of a shrouded structure around a small wind turbine. The
objective was assessing the induced increment on their productivity, evaluating power
coefficient. Laboratory measurements showed that improvements were obtained on electrical
output, resulting in a maximum increase of 120 %. Measurements showed a power
augmentation by a factor about 1.5-2.3, compared with the rotor without the shroud. Where a
more pronounced augmentation is achieved at lower velocities. These increments attained,
comparatively with previous studies, are shown in the same order of magnitude. Whereas an
enhancement more pronounced relative to previous studies made for distinct shroud designs.
Numerical simulations implemented in ANSYS FLUENT, modelled the rotor performance
describing a non-similar trend on their respective power coefficients, comparatively with
those obtained in experimentally. CFD calculations were performed at flow (Re=25343) with
values of 6 and 14 m/s to the C-D device. CFD calculations performed an evaluation of the
velocity experienced in the action rotor zone, which provided maximum increase of these air
velocities of 81 % and 86 %, respectively.
