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Pressure Force Response on a Sphere in Unsteady Flow with Sinusoidally Alternating Crosswind

Müller, Max and Ehrenfried, Klaus and Wagner, Claus (2022) Pressure Force Response on a Sphere in Unsteady Flow with Sinusoidally Alternating Crosswind. In: Proceedings of GALA 2022, 23.1-23.8. Deutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V.. GALA Fachtagung "Experimentelle Strömungsmechanik" 2022, 2022-09-06 - 2022-09-09, Ilmenau, Deutschland. ISBN 978-3-9816764-8-8. ISSN 2194-2447.

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Official URL: https://www.gala-ev.org/images/Beitraege/Beitraege2022/pdf/23.pdf

Abstract

The response forces on a sphere in sinusoidal cross winds with frequencies between 20 Hz and 50 Hz and small amplitudes (<3°) derived from surface pressure measurements have been investigated in wind tunnel experiments. Two different undisturbed inflow velocities were considered, which lead to a sub- and a supercritical flow separation pattern. The amplitude of the side force response was found to depend linearly on the amplitude of the inflow angle and grows non-linearly with increasing reduced frequency. The phase angle between inflow and side force response increases linearly with the reduced frequency. Both the amplitude and the phase angle of the side force response collapse on a single trend for the sub- and supercritical flow separation, hence the trend is only a function of the reduced frequency. Calculating a virtual point of force application, where the force is in phase with the inflow angle, it was shown that this point is independent of the reduced frequency.

Item URL in elib:https://elib.dlr.de/187693/
Document Type:Conference or Workshop Item (Speech)
Additional Information:https://www.gala-ev.org/images/Beitraege/Beitraege2022/index.html
Title:Pressure Force Response on a Sphere in Unsteady Flow with Sinusoidally Alternating Crosswind
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Müller, MaxUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ehrenfried, KlausUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wagner, ClausUNSPECIFIEDhttps://orcid.org/0000-0003-2273-0568UNSPECIFIED
Date:6 September 2022
Journal or Publication Title:Proceedings of GALA 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:23.1-23.8
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
Cierpka, ChristianInstitut für Thermodynamik und Fluidmechanik, Technische Universität IlmenauUNSPECIFIEDUNSPECIFIED
König, JörgInstitut für Thermodynamik und Fluidmechanik, Technische Universität IlmenauUNSPECIFIEDUNSPECIFIED
Ruck, BodoDeutsche Gesellschaft für Laser-Anemometrie, GALA e.V., KarlsruheUNSPECIFIEDUNSPECIFIED
Leder, AlfredFakultät Maschinenbau und Schifftechnik, Universität RostockUNSPECIFIEDUNSPECIFIED
Publisher:Deutsche Gesellschaft für Laser-Anemometrie - German Association for Laser Anemometry GALA e.V.
ISSN:2194-2447
ISBN:978-3-9816764-8-8
Status:Published
Keywords:pressure force answer, admittance, unsteady inflow
Event Title:GALA Fachtagung "Experimentelle Strömungsmechanik" 2022
Event Location:Ilmenau, Deutschland
Event Type:international Conference
Event Start Date:6 September 2022
Event End Date:9 September 2022
Organizer:Deutsche Gesellschafft für Laser-Anemometrie GALA e.V.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Müller, Max
Deposited On:07 Dec 2022 14:50
Last Modified:24 Apr 2024 20:49

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