Volumetric velocity measurements of a helical vortex pair
| Autor: | Schröder, Dominic, Leweke, Thomas, Hörnschemeyer, Ralf, Stumpf, Eike |
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| Přispěvatelé: | Institute of Aerospace Systems (ILR), Rheinisch-Westfälische Technische Hochschule Aachen University (RWTH), Institut de Recherche sur les Phénomènes Hors Equilibre (IRPHE), Aix Marseille Université (AMU)-École Centrale de Marseille (ECM)-Centre National de la Recherche Scientifique (CNRS), Leweke, Thomas |
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
vortex flow vortex instability volumetric velocimetry helical vortex system rotor wake
volumetric velocimetry rotor wake [PHYS.MECA.MEFL] Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] helical vortex system [PHYS.MECA.MEFL]Physics [physics]/Mechanics [physics]/Fluid mechanics [physics.class-ph] vortex instability vortex flow |
| Zdroj: | 33rd Congress of the International Council of the Aeronautical Sciences (ICAS 2022) 33rd Congress of the International Council of the Aeronautical Sciences (ICAS 2022), Sep 2022, Stockholm, Sweden. Paper ICAS2022_0083 |
| Popis: | International audience; This paper presents the results of an experimental study fn a helical vortex pair which is influenced by centrifugal instability. Volumetric velocity measurements using particle tracking methods are performed in a water channel for a one-bladed rotor in hovering conditions. The vortex pair is generated by a specific tip design which provokes the single tip vortex to split up into two separate vortices. The objective of this modification is to alter the characteristic vortex parameters by means of mutual interactions to minimise the negative effects associated with blade-vortex interactions. Previous studies showed that for selected vortex systems an immediate rapid core growth for both vortices is detected. The reason for this conduct was found in the occurence of centrifugal instabilities affecting both vortices. These instabilities cause a rapid disturbance of the vortex pair resulting in the observed significant core growth. To reveal the three-dimensional characteristics of the instability, volumetric measurements are performed. The results are compared to stereo particle image velocimetry data for validation purposes. Due to the unsteady behaviour, instantaneous snapshots are investigated to detect the secondary vortices caused by the instability. A statistical evaluation shows that the presence of those structures is pronounced in the early wake age, corresponding to the strongest impact of the instability. |
| Databáze: | OpenAIRE |
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