| 摘要 |
A vertical axis wind turbine ( 1 ) comprises three vertically extending sails ( 8 ) where each sail ( 8 ) comprises a strip ( 80 ) of substantially constant width. The opposite ends of each sail ( 8 ) are longitudinally twisted to have a pitch angle of approximately 90 degrees. The turbine ( 1 ) further comprises a vertically extending central core ( 7 ) and a vertically extending opening ( 9 ) between each sail ( 9 ) and the core ( 7 ). Also disclosed is an improvement in a vertical axis wind turbine ( 91 ) having at least one main blade ( 94 ) each of which has a longitudinal extent and a longitudinally extending radially outermost edge ( 924 ). The improvement comprises a longitudinally extending auxiliary blade ( 944 ) spaced from the main blade ( 94 ) to define a venturi inducing gap ( 99 ) between the main blade ( 94 ) and the auxiliary blade ( 944 ) whereby the turbine ( 91 ) has a zone of influence which extends radially beyond the maximum radial extent of the blades.
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