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    An adapted blockage factor correlation approach in wind tunnel experiments of a Savonius-style wind turbine

    Access Status
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    Authors
    Roy, Sukanta
    Saha, U.
    Date
    2014
    Type
    Journal Article
    
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    Citation
    Roy, S. and Saha, U. 2014. An adapted blockage factor correlation approach in wind tunnel experiments of a Savonius-style wind turbine. Energy Conversion and Management. 86: pp. 418-427.
    Source Title
    Energy Conversion and Management
    DOI
    10.1016/j.enconman.2014.05.039
    ISSN
    0196-8904
    School
    Curtin Malaysia
    URI
    http://hdl.handle.net/20.500.11937/61191
    Collection
    • Curtin Research Publications
    Abstract

    An investigation into the blockage correction effects in wind tunnel experiments of a small-scale wind energy conversion system in an open type test section is carried out. The energy conversion system includes a Savonius-style wind turbine (SSWT) and a power measurement assembly. As the available correlations for the closed type test sections may not be appropriate for the open test section under dynamic loading conditions, new correlations are adapted for the blockage correction factors with free stream wind speed, turbine rotational speed and variable load applied to the turbine to quantify the energy conversion coefficients more precisely. These are obtained for a blockage ratio of 21.16% through a comparison of present experimental data with those of established experimental data under dynamic loading conditions. Further, the accuracy of the adapted correlations is substantiated into the experiments with smaller blockage ratios of 16% and 12.25%. The relationships of the tip speed ratios and blockage ratios with the blockage correction factor are also discussed. Using these correlations, this study provides evidence of increase of blockage correction in the range 1-10% with the increase of both tip speed ratio and blockage ratio. The results also indicate that for blockage ratios approaching 10 and tip speed ratios below 0.5, the blockage effects are almost negligible in the open type test sections.

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