Torsional galloping with magnetic repulsion vertical axis current turbine

The article proposes an innovative concept of a current turbine based on the torsional galloping phenomenon, combined with the magnetic repulsion of a streamlined thin vertical plate, intended to harvest energy from low-head water currents. The driving proposal is to exploit the inherent instability of the arrangement. Hence, a careful non-linear instability analysis using the Poincaré method was performed numerically and experimentally. The mathematical model based on Bessel functions and potential theory was validated experimentally. The study carried out different configurations, comprising different stability conditions. The variances are selected by variance analysis. Since energy extraction is performed due to its unstable behavior, the occurrence of a stable condition must be avoided. It has been possible to select the condition where the turbine presents the most significant instability and the one that will provide higher efficiency. A final experimental set-up reached conclusive and successful feasibility.

Subjects

Experimental analysis

Innovative current turbine

Magnetic repulsion

Poincaré method

Renewable energy

Stability analysis

Torsional galloping

DDC Class

620: Engineering

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Torsional galloping with magnetic repulsion vertical axis current turbine