This work introduces a modified double-multiple streamtube model for Vertical Axis Wind Turbines (VAWT) that takes into account some parameters that were neglected till now. For example, the model considers the directions of the flow, rather than assuming that the flow is parallel to the free-wind. Also a formulation is established to calculate the effect of inclination of the blades in any direction. The modifications are facilitated by considering the momentum conservation in a direction perpendicular to the force (which was abandoned in the traditional models). The model results are compared to other models and to experimental results with a fair agreement.
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