Abstract
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.
Original language | English (US) |
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Journal | Collection of Technical Papers - AIAA Applied Aerodynamics Conference |
DOIs | |
State | Published - 2009 |
Event | 27th AIAA Applied Aerodynamics Conference - San Antonio, TX, United States Duration: Jun 22 2009 → Jun 25 2009 |
All Science Journal Classification (ASJC) codes
- Aerospace Engineering
- Mechanical Engineering