Title

The Influence of the Lengths of Turbine Blades on the Power Produced by Miniature Wind Turbines that Operate in Non-uniform Flow Fields

Document Type

Article

Publication Date

2012

Publication Source

World Transactions on Engineering and Technology Education (WTE&TE)

Volume

10

Issue

2

Inclusive pages

128-133

Publisher

UNESCO * International Centre for Engineering Education

Place of Publication

Australia

ISBN/ISSN

1446-2257

Abstract

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.

Disciplines

Engineering

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