The Influence of the Lengths of Turbine Blades on the Power Produced by Miniature Wind Turbines that Operate in Non-uniform Flow Fields
World Transactions on Engineering and Technology Education (WTE&TE)
UNESCO * International Centre for Engineering Education
Place of Publication
Non-uniform flow from a box fan was used to test the power produced by four miniature wind turbines equipped with rectangular blades of different lengths. Flow from the fan was modelled using the solution proposed by Schlichting for a laminar free jet in the plane. Derived analytical results suggested that power produced by turbines immersed in such a flow would increase with the radius of the turbine blades up to a maximum value and, then, decrease with further increases in the size of the radius. Experimental and analytical results were in excellent qualitative agreement: turbines with shorter blades produced more power than those with longer blades consistently, which is the reverse of what might be expected when turbines are subjected to uniform wind speeds. Results indicate that the zone in which power output increases with increasing radii necessitated speeds that were not reached in the tests that were conducted.
Josue Njock Libii and David Drahozal (2012).
The Influence of the Lengths of Turbine Blades on the Power Produced by Miniature Wind Turbines that Operate in Non-uniform Flow Fields. World Transactions on Engineering and Technology Education (WTE&TE).10 (2), 128-133. Australia: UNESCO * International Centre for Engineering Education.