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

Letzgus, Johannes and Gardner, Anthony and Schwermer, Till and Keßler, Manuel and Krämer, Ewald (2017) Numerical investigations of Dynamic Stall on a Rotor with Cyclic Pitch Control. 43rd European Rotorcraft Forum, 12.-15. Sept. 2017, Milan, Italy.

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Official URL: https://www.erf2017.org/content/accommodation-0

Abstract

Numerical investigations of three-dimensional dynamic stall on a two-bladed Mach-scaled rotor (R = 0.65m, Ma75 = 0.21, Re75 = 3.5 × 105) with 1/rev cyclic pitch control are presented and compared to experimental surface pressure and PIV data. In addition to URANS simulations using the finite-volume flow solvers FLOWer and TAU, a delayed detached-eddy simulation (DDES) with Menter SST as underlying 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 as seen in the experiment, which is not the case with URANS. However, common hybrid RANS-LES issues – grid-induced separation and the grey 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 SA 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/113900/
Document Type:Conference or Workshop Item (Speech)
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, Anthonyanthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Schwermer, TillTill.Schwermer (at) dlr.dehttps://orcid.org/0000-0002-6918-4480
Keßler, ManuelUniversität Stuttgart, IAGUNSPECIFIED
Krämer, Ewalduniversität stuttgartUNSPECIFIED
Date:2017
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Dynamic stall, rotor, RTG, DDES, URANS, TAU, FLOWER
Event Title:43rd European Rotorcraft Forum
Event Location:Milan, Italy
Event Type:international Conference
Event Dates:12.-15. Sept. 2017
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: Bachmann, Barbara
Deposited On:30 Nov 2017 15:08
Last Modified:30 Nov 2017 15:08

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