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A viscous vortex lattice method for analysis of cross-flow propellers and turbines

Author

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  • Epps, Brenden P.
  • Roesler, Bernard T.
  • Medvitz, Richard B.
  • Choo, Yeunun
  • McEntee, Jarlath

Abstract

Marine hydrokinetic turbines are a promising source of renewable energy, but the costs of existing cross-flow turbine designs are too high. In order to develop new designs with reduced costs, there exists a need for a low-order computational model that is simultaneously fast, accurate, and robust. Herein, we present a novel theoretical model for the analysis of cross-flow propellers and turbines based on the vortex lattice method (VLM). In order to overcome the limitation that the VLM ignores viscous effects (such as trailing-edge flow separation), we present a novel method to account for viscous-thickness-load coupling (VTLC). In order to overcome the difficulty that wake passages cause the VLM to be unstable, we present the panel-averaged induced velocity for the influence of wake vortices on the blades. Herein, we describe our model and provide verification versus RANS CFD. Results show that our VLM + VTLC model predictions are three times more accurate than prior low-order models (i.e. three times lower root mean square error to high-fidelity RANS results) yet 10,000 times faster than RANS over a wide range of operating conditions.

Suggested Citation

  • Epps, Brenden P. & Roesler, Bernard T. & Medvitz, Richard B. & Choo, Yeunun & McEntee, Jarlath, 2019. "A viscous vortex lattice method for analysis of cross-flow propellers and turbines," Renewable Energy, Elsevier, vol. 143(C), pages 1035-1052.
    • Handle: RePEc:eee:renene:v:143:y:2019:i:c:p:1035-1052
    DOI: 10.1016/j.renene.2019.05.053
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    References listed on IDEAS

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