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Double multiple streamtube model for variable pitch vertical axis wind turbines

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Figure

Figure 1. Geometry of streamtubes in the plane of rotation.
Figure 2. Aerofoil flow variables convention for a blade in the first quadrant at an azimuthal position close to 45o
Figure 3. a) The sinusoidal pitch regime designed to improve peak aerodynamic performance
Figure 4. Aerodynamic simulations for the test H-rotor operating at lamda = 2.5. a) Angle of Attack b) Induction Factor c) Tangential Force Coefficient d) Normal Force Coefficient
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