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Predicting Double-Blade Vertical Axis Wind Turbine Performance by a Quadruple-Multiple Streamtube Model

  • Hara, Yutaka ;
  • Kawamura, Takafumi ;
  • Akimoto, Hiromichi ;
  • Tanaka, Kenji ;
  • Nakamura, Takuju ;
  • Mizumukai, Kentaro
  • Received : 2013.12.02
  • Accepted : 2014.01.21
  • Published : 2014.03.31

Abstract

Double-blade vertical axis wind turbines (DB-VAWTs) can improve the self-starting performance of lift-driven VAWTs. We here propose the quadruple-multiple streamtube model (QMS), based on the blade element momentum (BEM) theory, for simulating DB-VAWT performance. Model validity is investigated by comparison to computational fluid dynamics (CFD) prediction for two kinds of two-dimensional DB-VAWT rotors for two rotor scales with three inner-outer radius ratios: 0.25, 0.5, and 0.75. The BEM-QMS model does not consider the effects of an inner rotor on the flow speed in the upwind half of the rotor, so we introduce a correction factor for this flow speed. The maximum power coefficient predicted by the modified BEM-QMS model for a DB-VAWT is thus closer to the CFD prediction.

Keywords

Wind turbine;Double-blade rotor;VAWT;BEM;CFD;QMS

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