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Power and thrust coefficients of the horizontal axis tidal stream turbine with different twist angles, blade numbers, and section profiles

Abbasi Alireza, Ghassemi Hassan, Molyneux David

Zeszyty Naukowe Akademii Morskiej w Szczecinie

2019

nr 57 (129)

11--20

The purpose of this research was to investigate the power and thrust coefficients of a horizontal axis tidal stream turbine (HATST) with different blade geometries, including twist angles, blade numbers, and section profiles. The RANS equations and Star-CCM+ commercial software were used to numerically analyze these variables. Furthermore, the turbulence model used in this study is a Realisable k-ε turbulent model. Nine different models were defined by changing the twist angle, thickness, camber, and blade numbers. The results are presented, and the power and thrust coefficients are compared against TSR for each of the nine different models. The pressure distribution and flow velocity contour are also presented and discussed.

Hydrodynamic performance of the horizontal axis tidal stream turbine using RANS solver

Ghassemi H., Ghafari H., Homayoun E.

Zeszyty Naukowe Akademii Morskiej w Szczecinie

2018

nr 55 (127)

23--33

This current work investigates the effect of duct and number of blades on the hydrodynamic performance of the horizontal axis tidal stream turbine (HATST). The numerical method based on Reynolds averaged Navier-Stokes (RANS) equations is employed to compare the hydrodynamic performance for various cases of this device. For validation of the numerical results, a 3-blade HATST without-duct has been compared against experimental data. The analysis and comparison of the simulation results show that using duct for HATST has increased the power coefficient, the torque coefficient, the trust coefficient, and the force on the blade. In addition, the simulation results of the cases with a greater number of blades shows that the trust coefficient increased and the force on the blade decreased. Therefore, it is recommended to use ducted HATST with a great number of blades to extract more energy from the tidal stream.