Numerical Analysis on Hydrodynamical Performance of Twin Half-rotating Impeller Tidal Turbine

To improve the utilization rate of tidal current energy, Twin Half-rotating Impeller Tidal Turbine(THITT), a new type of tidal turbine was proposed based on the half-rotating impeller(HRI) which was a new type lift-resistance compound impeller, and its virtual prototype was established. By changing the way the impeller rotated, two kinds of CFD models were established and taken into Xflow to calculate. The differences in their velocity fields and hydrodynamical performance were compared. The results demonstrated that THITT of different rotating directions both own good start-up performance and there were no dead points. Compared with the output power of the two independent impellers, the output power was increased by 20% when rotating in the spin.