On the aerodynamic performance of a class of vertical shaft windmills

Shankar, PN (1976) On the aerodynamic performance of a class of vertical shaft windmills. Proceedings of the Royal Society of London, 349 (1656). pp. 35-51.

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Abstract

The aerodynamic performance of a vertical shaft windmill developed for the purpose of energy production is analyzed. Induced velocity is derived from simple momentum theory while a rotor blade element analysis yields equations for calculating the mean power coefficient. The uniform induced velocity theory can be linearized for high blade tip speed ratios to yield a simple formula for the mean power coefficient. Using propeller theory, the case of nonuniform induced velocity over the windmill disk is analyzed. The calculations and wind tunnel tests show that this class of windmills has efficiencies comparable to those of the best horizontal axis windmills.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Royal Society
Uncontrolled Keywords: Aerodynamic characteristics;Momentum theory;Rotor blades; Windmills(windpowered machines);Air flow;Airfoils;Angular velocity;Graphs(Charts);Shafts(Machine elements);Tip speed
Subjects: AERONAUTICS > Aeronautics (General)
Division/Department: Computational and Theoretical Fluid Dynamics Division
Depositing User: M/S ICAST NAL
Date Deposited: 08 Jan 2007
Last Modified: 24 May 2010 09:54
URI: http://nal-ir.nal.res.in/id/eprint/3850

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