Abstract
The present work includes analysis of the results obtained with a free wake code to determine two simple, non-iterative prescribed wake models aimed for use in steady load and design calculations for rotors with winglets. The results show that results from a prescribed wake model using only the integral axial load on the rotor and the main geometry of the wing/winglet can produce results in qualitative agreement with the physically more correct free wake model. The results indicate, however, that the power production estimated from the prescribed wake models using only the integral loads and no local loadings and/or induced velocities along the blade will be erroneous if the load distribution along the wing is not similar to the one the model was calibrated for.
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