This paper presents an application of single stream tube theory to the straight blade, non-articulated vertical axis wind turbine. In addition to the contribution of blades to wind turbine performance, effect of blade support arms is taken into consideration. This paper also presents some examples of the effects of parameters characterizing wind turbine configuration and geometry. They are blade solidity, number of blades and height diameter ratio. Effects of aerodynamic characteristics of air foil and its pitch attitude with regard to support arm are also presented. Besides, we compared the theory with the experiment; as a result, we confined our applied theory.
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