EXPERIMENTAL STUDY ON LOW-SPEED VERTICAL AXIS CURRENT TURBINE (LS-VACT) WITH DIVERTER
DOI:
https://doi.org/10.11113/jtse.v12.251Keywords:
vertical axis current turbine, flow diverter, Renewable Energy, towing tank test, turbine power coefficientAbstract
The increasing demand for sustainable energy solutions has intensified the exploration of marine current energy systems in low-speed current regions such as those found in Malaysia. This study investigates the performance enhancement of a Low-Speed Vertical Axis Current Turbine (LS-VACT) through the integration of a curved shape diverter. The primary objective is to evaluate the diverter's effect on power coefficient (Cp), torque coefficient (Ct) and efficiency under controlled towing tank conditions at current speed of 0.4 m/s. Two configurations were tested; the LS-VACT arm attached turbine with and without curved diverter angled at 30°. The turbine with diverter achieved an enhancement for the maximum Cp, reaching up to 50% increase over the baseline at TSR 0.55 while maintaining favourable torque generation and improved TSR across different RPM. The diverter improved flow interaction with the advancing blade. The findings validate the application of curved shape diverters as a practical and passive method to improve LS-VACT performance in low-speed marine environments.
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