Abstract
In order to elucidate the optimum condition about the dimension and location of wind turbine rotor for duct-flow power generation, two-dimensional CFD analysis, in which the relative ratio between the duct width W and the turbine rotor diameter D was set at various values, was carried out. The wind turbine rotor was assumed to be a vertical axis type with double-blade configuration. The outer rotor diameter was fixed at 0.4m as D. The length L of the two-dimensional duct was fixed at 8m (L=20D), the wind velocity at the inlet of the duct was fixed at 6 m/s as V. The numerical analysis was conducted on the basis of the Reynolds-averaged Navier-Stokes (RANS) equations with the turbulence model of SST k-ω. The energy recovery rate η was highest in the case of W/D = 0.25. In the case, the rotor gave little influence on the duct. However, according to the new criteria ξ defined as the multiplication between the rotor power coefficient Cp and the energy recovery rate η, a condition of W/D = 0.5 was found to be the optimum. At the optimum condition, the rotor was located on the centerline of the duct flow, and the distance between the rotor and the duct exit was 1.5 times as long as the rotor diameter.
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