PSI - Issue 47

Bayu Anggara et al. / Procedia Structural Integrity 47 (2023) 675–684 677 Bayu Anggara, Dominicus Danardono DPT*, Eko Prasetya Budiana / Structural Integrity Procedia 00 (2019) 000 – 000 3

The vortex generator device has many types when viewed from its geometry and dimensions, one of which is the High-Efficiency Vortex (HEV), where the device is applied to a gas mixer. Ghanem et al. (2013) suggested that HEV is an innovative static mixer in heat transfer. The shear stress layer of the vortex generator shows that the turbulent kinetic energy has increased. Dong and Meng (2004) investigated the impact of applying mixing tabs with trapezoidal geometry, also known as trapezoidal tabs, on the flow through the device, which produces the highest turbulent kinetic energy. Nair et al. (2020) investigated micro tabs on horizontal wind turbines, which produce a larger lift force and a more significant power coefficient. Several previous studies analyzed the addition of a High-Efficiency Vortex (HEV) on gas mixers and heat transfer devices, but the VAWT has yet to be carried out. This study aimed to determine the effect of adding a High-Efficiency Vortex (HEV) on the performance of the Darrieus H Rotor wind turbine. The main objective of this study is to find the best high-efficiency Vortex (HEV) geometry on the Darrieus H Rotor. The power coefficient, torque, and flow characteristics of the rotors from the variation are analyzed in this study. 2. Methods 2.1. Wind Turbine Modeling The turbine used in this study was a Darrieus H Rotor with a NACA 0015 airfoil blade profile. The geometry and dimensions of the turbine in this study refer to the research by Song et al. (2019). The rotor diameters are 1650 mm, and the chord length is 375 mm — turbine installation angle 0°. The blades are attached to the hub or rotor arm at 30% of the chord length. The turbine has three blades that rotate counterclockwise around the center. The simulation is run on 3D numerical. This investigation contains two domains, namely the rotor domain and the stator domain, where the diameter of the rotor influences the dimensions. For the area around the turbine that is still affected by turbine rotation, we set it as a rotor domain with 1.5D dimensions. Furthermore, the geometry and dimensions of the turbine can be seen in Table 1

Table 1. Darrieus H Rotor Parameter. Parameter

Symbol

Value

Wind (m/s)

V N D H c

8 3

Blade number

Rotor diameter (mm) Rotor height (mm) Blade chord length (mm)

1650 1000 375