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In the present article, the authors are performing a comparison study between two vortex models for the numerical computation of the static thrust of a model helicopter rotor in hover. The aim of this study is to access the rapidity and accuracy of the vortex models, comprised of a series of vortex rings and a single semi-infinite vortex cylinder. The first model has a cylindrical arrangement of the vortex elements, while the second model has a contracting arrangement of its vortex elements. Studies are performed for the optimal positioning and spacing of the vortex elements, in order to provide both rapid computation and good agreement with the experimental data, obtained from a wind tunnel test of the model rotor. The results of the study show a slight increase in the required computational time for the case of the contracting wake, while offering a significantly better accuracy than the cylindrical wake. Another interesting result from the numerical study is that in the case of the contracting wake model there is a reduction of the spacing (compression) between the vortex rings in the near wake, which results in the reduction of the overall length of the vortex system trailing downstream of the rotor.

NUMERICAL STUDY ON THE INFLUENCE OF WAKE CONTRACTION ON THE COMPUTATIONAL ACCURACY AND RAPIDITY OF A MODEL OF A ROTOR IN HOVER