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Zonal Large-Eddy Simulation of a Fan Tip-Clearance Flow, With Evidence of Vortex Wandering

Boudet, Jérôme and Cahuzac, Adrien and Kausche, Philip and Jacob, Marc (2013) Zonal Large-Eddy Simulation of a Fan Tip-Clearance Flow, With Evidence of Vortex Wandering. ASME Journal of Turbomachinery. American Society of Mechanical Engineers (ASME). ISSN 0889-504X

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The flow in a fan test-rig is studied with combined experimental and numerical methods, with a focus on the tip-leakage flow. A zonal RANS/LES approach is introduced for the simulation: the region of interest at tip is computed with full large-eddy simulation (LES), while Reynolds-averaged Navier-Stokes (RANS) is used at inner radii. Detailed comparisons with the experiment show that the simulation gives a good description of the flow. In the region of interest at tip, a remarkable prediction of the velocity spectrum is achieved, over about six decades of energy. The simulation precisely captures both the tonal and broadband contents. Furthermore, a detailed analysis of the simulation allows identifying a tip-leakage vortex wandering, whose influence onto the spectrum is also observed in the experiment. This phenomenon might be due to excitation by upstream turbulence from the casing boundary layer and/or the adjacent tipleakage vortex. It may be a precursor of rotating instability. Finally, considering the outlet duct acoustic spectrum, the vortex wandering appears to be a major contribution to noise radiation.

Item URL in elib:https://elib.dlr.de/85945/
Document Type:Article
Title:Zonal Large-Eddy Simulation of a Fan Tip-Clearance Flow, With Evidence of Vortex Wandering
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Boudet, JérômeECL, Jerome.Boudet (at) ec-lyon.frUNSPECIFIED
Cahuzac, AdrienECL, adrien.cahuzac (at) ec-lyon.frUNSPECIFIED
Kausche, PhilipDLR, philip.kausche (at) dlr.deUNSPECIFIED
Jacob, MarcECL, marc.jacob (at) ec-lyon.frUNSPECIFIED
Journal or Publication Title:ASME Journal of Turbomachinery
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Society of Mechanical Engineers (ASME)
Keywords:zonal large-eddy simulation, fan test-rig, broadband noise, tip-leakage vortex wandering
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies (old)
Location: other
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Kausche, Philip
Deposited On:08 Jan 2014 15:18
Last Modified:08 Mar 2018 18:53

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