Pengaruh Desain Interior Diffuser Terhadap Peningkatan Performa Diffuser Augmented Wind Turbine (DAWT)

The main objective of numerical simulation in this studies is to determine the effect of diffuser’s interior design on increasing the diffuser augmented wind turbine (DAWT) performance by observing wind velocity increment. Numerical studies were carried out using the computational Fluid Dynamics (CFD) method through a two-dimensional steady approach with Ansys Fluent 18.2 and Ansys Workbench 18.2 software. The present studies spesifically investigate the shapes of diffuser, namely flat diffuser and curved diffuser. The studies demonstrate that the curved diffuser generates stronger increment of the wind velocity than flat diffuser (at centreline), which 1.842 times the freestream velocity, while the flat diffuser is only able to increse up to 1.742 times the freestream velocity. The curved diffuser shows the highest increment of the average wind velocity along diffuser with the greatest increment of 78.66 % and the flat diffuser is only able to provide average wind velocity increment up to 44.81%. The curved interor of diffuser is able to enlarge the wake area, so the effect of the suction flow entering the diffuser becomes stronger. Therefore, curved diffuser is better to provide DAWT performance improvements.