Letzgus, Johannes and Gardner, Anthony D. and Schwermer, Till and Keßler, Manuel and Krämer, Ewald (2019) Numerical Investigations of Dynamic Stall on a Rotor with Cyclic Pitch Control. Journal of the American Helicopter Society, 64 (012007), pp. 1-14. American Helicopter Society. doi: 10.4050/JAHS.64.012007. ISSN 0002-8711.
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Abstract
Numerical computations of three-dimensional dynamic stall on a two-bladed model rotor (R = 0.65 m, M_75 = 0.21, Re_75 = 3.5 × 10*5) with 1/rev cyclic pitch control are presented and compared to experimental surface pressure and particle image velocimetry data. In addition to unsteady Reynolds-averaged Navier-Stokes (URANS) simulations using the finite-volume flow solvers FLOWer and TAU, a delayed detached-eddy simulation (DDES) with Menter shear-stress transport (SST) as underlying Reynolds-averaged Navier-Stokes (RANS) model is carried out with FLOWer. Facing dynamic stall and flow separation, the DDES reproduces high-frequency load fluctuations, cycle-to-cycle variations, and small-scale vortical structures observed in the experiment, unlike the URANS results. However, common hybrid RANS/large-eddy simulation issues - grid-induced separation (GIS) and the gray area problem - play a role in this DDES and influence loads severely. FLOWer SST simulations yield load peaks of the same magnitude as individual, non-phase-averaged measurements. With TAU SST, the dynamic stall event is delayed and weakened compared to FLOWer SST and experimental results. FLOWer and TAU results using the Spalart-Allmaras turbulence model are fairly comparable but in bad agreement with the experiment at the outboard station at r/R = 0.77, where they exhibit no dynamic stall at all.
Item URL in elib: | https://elib.dlr.de/126072/ | ||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||
Title: | Numerical Investigations of Dynamic Stall on a Rotor with Cyclic Pitch Control | ||||||||||||||||||
Authors: |
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Date: | 16 January 2019 | ||||||||||||||||||
Journal or Publication Title: | Journal of the American Helicopter Society | ||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||
Open Access: | No | ||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||
Volume: | 64 | ||||||||||||||||||
DOI : | 10.4050/JAHS.64.012007 | ||||||||||||||||||
Page Range: | pp. 1-14 | ||||||||||||||||||
Editors: |
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Publisher: | American Helicopter Society | ||||||||||||||||||
ISSN: | 0002-8711 | ||||||||||||||||||
Status: | Published | ||||||||||||||||||
Keywords: | dynamic stall, rotor, RTG, DDES, URANS, TAU, FLOWER | ||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||
HGF - Program: | Aeronautics | ||||||||||||||||||
HGF - Program Themes: | rotorcraft | ||||||||||||||||||
DLR - Research area: | Aeronautics | ||||||||||||||||||
DLR - Program: | L RR - Rotorcraft Research | ||||||||||||||||||
DLR - Research theme (Project): | L - The Virtual Aerodynamic Rotorcraft (old) | ||||||||||||||||||
Location: | Göttingen | ||||||||||||||||||
Institutes and Institutions: | Institute for Aerodynamics and Flow Technology > Helicopter, GO | ||||||||||||||||||
Deposited By: | Winkels, Elisabeth | ||||||||||||||||||
Deposited On: | 23 Jan 2019 14:33 | ||||||||||||||||||
Last Modified: | 24 Jan 2019 14:42 |
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