E.A. Badr and R.F. Ghajar (Lebanon)
Renewable energy, wind turbine, Energy conversion and conservation.
A Diffuser Augmented Wind Turbine (DAWT) has been an attractive concept of wind energy extraction since the early 1970's due to the system's ability to increase the power generated by a regular bare turbine of the same size. However, the DAWT needs to reach a minimum augmentation ratio of 4 in order to become economically feasible. This paper investigates the possible improvement to the DAWT system by adding a collector fuselage to further increase the augmentation ratio of wind turbines. Testing using an experimental unit shows that adding a collector increases the power augmentation of the DAWT by more than 50%. Moreover, the Collector and Diffuser Augmented Wind Turbine (CDAWT) can keep extracting wind energy, without any loss in augmentation ratio, as wind direction varies 30 from the turbine axes, thus eliminating the requirement of a yaw mechanism.
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