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Computational Characterization of Unsteady Rotor Hub Wakes

Forrest Mobley, James Coder, Tristan Wall, University of Tennessee

May 10, 2021

https://doi.org/10.4050/F-0077-2021-16878

Abstract:
Reynolds stresses and turbulent kinetic energy are studied in the wakes for several helicopter rotor hub geometries in forward flight. Computational Fluid Dynamics (CFD) simulations are performed using NASA's OVERFLOW 2.2n Reynolds-averaged Navier Stokes solver. The simulations impose flow conditions based on previous and current experimental and numerical studies. Discrete Fourier Transforms (DFT) are used to examine velocity harmonics for several frequencies and compared against experimental data. Components of the Reynolds stress tensor are computed and examined. Production, transport, and flux of the turbulent kinetic energy are examined through the rotor hub wakes at six streamwise coordinates. Proper orthogonal decomposition is also used to examine a dominant component of the Reynolds stress tensor. It was found that the scissor arms, previously found to have a significant effect on rotor hub force harmonics, also had a significant effect on the magnitudes of Reynolds stresses and turbulent kinetic energy. Integrated values of turbulent kinetic energy flux and transport indicate that a relation between geometry and turbulent kinetic energy levels exists.


Computational Characterization of Unsteady Rotor Hub Wakes

  • Presented at Forum 77
  • 17 pages
  • SKU # : F-0077-2021-16878
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Computational Characterization of Unsteady Rotor Hub Wakes

Authors / Details:
Forrest Mobley, James Coder, Tristan Wall, University of Tennessee