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Numerical Investigations of Dynamic Stall on a Rotor with Cyclic Pitch Control

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/
Document Type:Article
Title:Numerical Investigations of Dynamic Stall on a Rotor with Cyclic Pitch Control
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Letzgus, JohannesUniversität Stuttgart, IAGUNSPECIFIED
Gardner, Anthony D.anthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Schwermer, TillTill.Schwermer (at) alumni-uni-hannover.dehttps://orcid.org/0000-0002-6918-4480
Keßler, ManuelUniversität Stuttgart, IAGUNSPECIFIED
Krämer, EwaldHead of IAG - University of StuttgartUNSPECIFIED
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:
EditorsEmail
UNSPECIFIEDVertical Flight Society
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
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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