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Rotating Instability in an Annular Cascade: Detailed Analysis of the Instationary Flow Phenomena

Pardowitz, Benjamin and Tapken, Ulf and Sorge, Robert and Thamsen, Paul Uwe and Enghardt, Lars (2013) Rotating Instability in an Annular Cascade: Detailed Analysis of the Instationary Flow Phenomena. ASME Journal of Turbomachinery (Volume). American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.4025734 ISSN 0889-504X

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Official URL: http://turbomachinery.asmedigitalcollection.asme.org/mobile/article.aspx?articleid=1760267


Rotating instability (RI) occurs at off-design conditions in compressors, predominantly in configurations with large tip or hub clearance ratios of s* �> 3%. RI is the source of the blade tip vortex noise and a potential indicator for critical operating conditions like rotating stall and surge. The objective of this paper is to give more physical insight into the RI phenomenon using the analysis results of combined near-field measurements with high-speed particle image velocimetry (PIV) and unsteady pressure sensors. The investigation was pursued on an annular cascade with hub clearance. Both the unsteady flow field next to the leading edge as well as the associated rotating pressure waves were captured. A special analysis method illustrates the characteristic pressure wave amplitude distribution, denoted as “modal events” of the RI. Moreover, the slightly adapted method reveals the unsteady flow structures corresponding to the RI. Correlations between the flow profile, the dominant vortex structures, and the rotating pressure waves were found. Results provide evidence to a new hypothesis, implying that shear layer instabilities constitute the basic mechanism of the RI.

Item URL in elib:https://elib.dlr.de/86205/
Document Type:Article
Title:Rotating Instability in an Annular Cascade: Detailed Analysis of the Instationary Flow Phenomena
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pardowitz, BenjaminBenjamin.Pardowitz (at) dlr.deUNSPECIFIED
Tapken, Ulfulf.tapken (at) dlr.deUNSPECIFIED
Sorge, RobertTU-Berlin / robert.sorge (at) fsd.tu-berlin.deUNSPECIFIED
Thamsen, Paul UweTU-Berlin / Paul-Uwe.Thamsen (at) tu-berlin.deUNSPECIFIED
Enghardt, Larslars.enghardt (at) dlr.deUNSPECIFIED
Date:3 September 2013
Journal or Publication Title:ASME Journal of Turbomachinery
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1115/1.4025734
Publisher:American Society of Mechanical Engineers (ASME)
Keywords:rotating instability, annular cascade, unsteady compressor aerodynamics
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: Berlin-Adlershof
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Pardowitz, Benjamin
Deposited On:08 Jan 2014 15:15
Last Modified:08 Mar 2018 18:53

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