PSI - Issue 47

Bayu Anggara et al. / Procedia Structural Integrity 47 (2023) 675–684 683 Bayu Anggara, Dominicus Danardono DPT*, Eko Prasetya Budiana / Structural Integrity Procedia 00 (2019) 000 – 000 9

Angle 0°

No HEV

Rectangular HEV

Trapezoid HEV

Triangular HEV

Fig. 8. Visualization of the turbulent kinetic energy of fluid flow at 0 ratation angle at TSR = 1.5 °

4. Conclusion In this paper, the aerodynamic performance of the Darrieus H Rotor wind turbine has been investigated using a computational fluid dynamic method. The investigation was carried out on three HEV geometry variations: rectangular, trapezoidal, and triangular. Turbines without HEV variations were also simulated in this study. High-Efficiency Vortex (HEV) can effectively increase the turbine's power coefficient and delay flow separation at a relatively high TSR. The highest power coefficient in this study was achieved by the HEV variation with triangular geometry at TSR 2.5 with a Cp value of 0.36, where this value experienced an increase of 13% compared to the variation without HEV. In line with the resulting Cp value, the visualization of the flow also shows that variations in the addition of HEV produce higher turbulent kinetic energy than variations without HEV. References Ã, Mazharul Islam, David S Ting, and Amir Fartaj. 2008. “Aerodynamic Models for Darrieus-Type Straight-Bladed Vertical Axis Wind Turbines.” 12: 1087–1109. Alqurashi, Faris, and M. H. Mohamed. 2020. “Aerodynamic Forces Affecting the H-Rotor Darrieus Wind Turbine.” Modelling and Simulation in Engineering 2020. Battisti, L. et al. 2018. “Small Wind Turbine Effectiveness in the Urban Environment.” Renewable Energy 129: 102– 13. https://doi.org/10.1016/j.renene.2018.05.062. Dong, Suchuan, and Hui Meng. 2004. “Flow Past a Trapezoidal Tab.” Journal of Fluid Mechanics 510: 219–42.