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Blade Tip-Vortices of a Four-Bladed Rotor with Axial Inflow

Goerttler, Andreas and Braukmann, Johannes N. and Wolf, C. Christian and Gardner, Anthony D. and Raffel, Markus (2020) Blade Tip-Vortices of a Four-Bladed Rotor with Axial Inflow. Journal of the American Helicopter Society, 65 (3), pp. 1-13. American Helicopter Society. doi: 10.4050/JAHS.65.042002. ISSN 0002-8711.

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Official URL: https://doi.org/10.4050/JAHS.65.042002

Abstract

The vortex system of four rotating and pitching DSA-9A blades was examined numerically and experimentally. Numerical computations were performed using German Aerospace Center (DLR)’s finite-volume solver TAU and were validated against experimental data gathered using particle image velocimetry carried out at the rotor test facility (RTG) in Göttingen. Algorithms deriving the vortex position, swirl velocity, circulation, and core radius were implemented. Hover-like conditions with a fixed blade pitch were analyzed giving further physical insights of the static vortex system. These results are used to understand the vortex development for the unsteady pitching conditions, which can be described as a superpositioning of static vortex states. The use of a zonal detached-eddy simulations approach improved physical modeling of the vortex development by resolving finer scales than URANS. Trimmed cases agree well with differences less than 0.5% in the circulation and swirl velocity.

Item URL in elib:https://elib.dlr.de/131892/
Document Type:Article
Additional Information:ISSN 2161-6027 (Print)
Title:Blade Tip-Vortices of a Four-Bladed Rotor with Axial Inflow
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Goerttler, Andreasandreas.goerttler (at) dlr.deUNSPECIFIED
Braukmann, Johannes N.Johannes.Braukmann (at) dlr.dehttps://orcid.org/0000-0001-8046-9623
Wolf, C. ChristianChristian.Wolf (at) dlr.dehttps://orcid.org/0000-0002-9052-7548
Gardner, Anthony D.anthony.gardner (at) dlr.dehttps://orcid.org/0000-0002-1176-3447
Raffel, MarkusMarkus.Raffel (at) dlr.dehttps://orcid.org/0000-0002-3340-9115
Date:24 July 2020
Journal or Publication Title:Journal of the American Helicopter Society
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:65
DOI :10.4050/JAHS.65.042002
Page Range:pp. 1-13
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDVertical Flight SocietyUNSPECIFIED
Publisher:American Helicopter Society
ISSN:0002-8711
Status:Published
Keywords:blade tip vortex, helicopter, rotor, CFD, experiment
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: Carter, Beatrice
Deposited On:25 Aug 2020 16:06
Last Modified:01 Sep 2021 03:00

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