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Interactive flow field around two Savonius turbines

Author

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  • Shigetomi, Akinari
  • Murai, Yuichi
  • Tasaka, Yuji
  • Takeda, Yasushi

Abstract

The use of a Savonius type of vertical axis wind turbine is expanding in urban environments as a result of its ability to withstand turbulence as well as its relatively quiet operation. In the past, single turbine performance has been investigated primarily for determining the optimum blade configuration. In contrast, combining multiple Savonius turbines in the horizontal plane produces extra power in particular configurations. This results from the interaction between the two flow fields around individual turbines. To understand quantitatively the interaction mechanism, we measured the flow field around two Savonius turbines in close configurations using particle image velocimetry. The phase-averaged flow fields with respect to the rotation angle of the turbines revealed two types of power-improvement interactions. One comes from the Magnus effect that bends the main stream behind the turbine to provide additional rotation of the downstream turbine. The other is obtained from the periodic coupling of local flow between the two turbines, which is associated with vortex shedding and cyclic pressure fluctuations. Use of this knowledge will assist the design of packaged installations of multiple Savonius turbines.

Suggested Citation

  • Shigetomi, Akinari & Murai, Yuichi & Tasaka, Yuji & Takeda, Yasushi, 2011. "Interactive flow field around two Savonius turbines," Renewable Energy, Elsevier, vol. 36(2), pages 536-545.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:2:p:536-545
    DOI: 10.1016/j.renene.2010.06.036
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    References listed on IDEAS

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