This paper presents a generalized and fast potential method for the computation of rotor wake flows. The potential solver is one that combines an Eulerian description of arbitrary vortical wake structures using the Vorticity-Embedding concept with a Lagrangian free wake advection scheme. Original implementation of the vorticity embedding for hover treated the wake as a single sheet from root to tip and used a cylindrical shaped grid to allow locally two-dimensional calculations for embedding. This approach was shown to be useful for engineering analysis by comparison against performance data for the model UH-60 rotor. A new formulation of embedding further decomposes these vortex sheets into smaller wake patches, each of which corresponds to a dipole. The advantage of this formulation is that it does not require the two-dimensionality assumption and can allow for arbitrary distortions of the wake sheets. This approach is first applied to a simple vortex ring problem and is compared to the original embedding formulation. Following this, the roll-up of vortex sheets is computed for the case of a single vortex ring sheet, a pair of vortex ring sheets, and for an elliptically loaded wing to demonstrate both the capability and the generality of the new embedding process. The paper concludes with a hover-type wake solution in an axisymmetric flowfield using the new embedding process, and gives an outlook on future developments that will extend the method to forward flight and full-vehicle configurations.
A generalized potential method for modeling rotor wake flows
Ein generalisiertes Potentialverfahren zur Modellierung von Rotor-Nachlaufströmungen
AIAA Applied Aerodynamics Conference, 27 ; 2009/3856-2009/15
2009
15 Seiten, 12 Quellen
Aufsatz (Konferenz)
Englisch
A Generalized Potential Method for Modeling Rotor Wake Flows
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