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Tip Vortex Study of a Rotor with Double-swept Blade Tips

Wolf, Christian and Braukmann, Johannes N. and Müller, Martin Michael (2022) Tip Vortex Study of a Rotor with Double-swept Blade Tips. In: 48th European Rotorcraft Forum, ERF 2022, pp. 1-17. 48th European Rotorcraft Forum (ERF 2022), 2022-09-06 - 2022-09-08, Winterthur, Schweiz. ISBN 978-171387029-6.

Full text not available from this repository.

Official URL: https://www.zhaw.ch/de/engineering/institute-zentren/zav/veranstaltungen/erf2022/

Abstract

An experimental aerodynamic study was conducted, analyzing the wake structure of a four-bladed model rotor with a forward-backward swept tip geometry inspired by the ONERA-DLR "ERATO" design. Similar tip designs are used on some modern helicopter main rotors. The experiments were conducted at the rotor test stand Göttingen in hover-like conditions using a stereoscopic high-speed particle image velocimetry system. The results are compared with a reference rotor using a conventional parabolic blade tip. The test parameters include both constant-pitch cases and pitch-oscillating cases with a cyclic swashplate input. The constant-pitch tests show a two-step stall behavior for the double-swept tip, with the first step characterized by a reduced thrust slope and a reduced rotor efficiency. This effect is explained by a repositioning and a structural change of the tip vortex generation. The pitch-oscillating cases show that the double-swept tip results in an earlier tip stall compared to the parabolic geometry while maintaining high thrust levels. The dynamic tip stall yields a break down of the wake’s tip vortex system, which is replaced by a spanwise band with small-scale turbulent structures and trailed vorticity, but no large-scale vortices.

Item URL in elib:https://elib.dlr.de/187972/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Vortrag mit Paper
Title:Tip Vortex Study of a Rotor with Double-swept Blade Tips
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Wolf, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-9052-7548UNSPECIFIED
Braukmann, Johannes N.UNSPECIFIEDhttps://orcid.org/0000-0001-8046-9623UNSPECIFIED
Müller, Martin MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:September 2022
Journal or Publication Title:48th European Rotorcraft Forum, ERF 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Page Range:pp. 1-17
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
UNSPECIFIEDZHAWUNSPECIFIEDUNSPECIFIED
ISBN:978-171387029-6
Status:Published
Keywords:Tip vortex, rotor performance, ERATO rotor, High-speed stereoscopic particle image velocimetry, rotor test stand Göttingen
Event Title:48th European Rotorcraft Forum (ERF 2022)
Event Location:Winterthur, Schweiz
Event Type:international Conference
Event Start Date:6 September 2022
Event End Date:8 September 2022
Organizer:Centre for Aviation (ZAV)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Rotorcraft and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Helicopter, GO
Institute of Aeroelasticity > Aeroelastic Experiments
Deposited By: Carter, Beatrice
Deposited On:23 Nov 2022 12:33
Last Modified:24 Apr 2024 20:49

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