OPTIMIZED CURVATURE INTERIOR PROFILE FOR DIFFUSER AUGMENTED WIND TURBINE (DAWT) TO INCREASE ITS ENERGY-CONVERSION PERFORMANCE

Suitable techniques to convert wind availability as a kind of renewable energy source in Indonesia (which are mostly in the low-speed regimes) need to be scrutinized to achieve effective and efficient conversion. The Diffuser-Augmented Wind Turbine (DAWT) concept offers the possibility to cope with such the unfavourable situation. In this paper we describe efforts to step-up potential power- augmentation offered by the DAWT. Modification of internal profile of the diffuser (based on Ohya’s configuration without a flange) is done by adding an optimized airfoil-shape as interior profile of the diffuser. Additional velocity augmentation of 65.5% can be achieved in comparison to the one with the original flat-interior.