Optimized curvature interior profile for Diffuser Augmented Wind Turbine (DAWT) to increase its energy-conversion performance

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