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Influence of lift to drag ratio on optimal aerodynamic performance of straight blade vertical axis wind turbines

Soraghan, Conaill and Leithead, William and Jamieson, Peter (2013) Influence of lift to drag ratio on optimal aerodynamic performance of straight blade vertical axis wind turbines. In: EWEA Annual Wind Energy Event 2013, 2013-02-04 - 2013-02-07.

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Abstract

This paper defines an effective lift to drag for a vertical axis wind turbine design based on averaged torque per cycle. This metric is used to characterise the relationship between overall optimum aerodynamic performance and design parameters. A double multiple streamtube aerodynamic prediction model is employed to demonstrate the effect of lift to drag ratio on optimal power performance for the H-rotor and the V-rotor concept VAWT. A further study looks at the effect of coning angle for the V-rotor.