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Experimental identification of rotating instability of an axial fan with shrouded rotor

Pardowitz, Benjamin and Moreau, Antoine and Tapken, Ulf and Enghardt, Lars (2015) Experimental identification of rotating instability of an axial fan with shrouded rotor. Proceedings of the Institution of Mechanical Engineers Part A: Journal of Power and Energy, 229 (5), pp. 520-528. SAGE Publications. DOI: 10.1177/0957650915595898 ISSN 0957-6509

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Official URL: http://pia.sagepub.com/content/229/5/520.refs

Abstract

The rotating instability phenomenon is investigated experimentally on a laboratory low-speed axial fan. Unsteady pressure measurements are performed close to the rotor leading edge, in the far-field in the upstream-duct section, and within the rotating frame by using Kulite sensors near the blade tip. As reference, the occurrence of rotating instability is proven for a rotor configuration with large clearance size. Existing explanations assume that rotating instability is induced by the tip clearance vortex. Following these models, the characteristic spectral and modal signatures of rotating instability are generated by the circumferentially coupled unsteady vortex systems within the individual blade passages. However, some early findings on a shrouded rotor setup and a study on an annular cascade without clearance have raised questions about the validity of the existing theories. To answer these questions, a second configuration is investigated using the identical rotor in a shrouded version. Here, a shrouding band covers the blade tips over the whole circumference. By using a comprehensive sensor arrangement in a wide variation of operating conditions, the existence of spectral and modal rotating instability signatures is proven on the shrouded-rotor configuration, as well. In this case, the tip clearance vortex system and, respectively, the leakage flow are suppressed. The present study underlines that novel explanations are required to describe the physical mechanism that generates rotating instability.

Item URL in elib:https://elib.dlr.de/101005/
Document Type:Article
Title:Experimental identification of rotating instability of an axial fan with shrouded rotor
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pardowitz, BenjaminBenjamin.Pardowitz (at) dlr.deUNSPECIFIED
Moreau, AntoineDLR, Institut für AntriebstechnikUNSPECIFIED
Tapken, Ulfulf.tapken (at) dlr.deUNSPECIFIED
Enghardt, Larslars.enghardt (at) dlr.deUNSPECIFIED
Date:August 2015
Journal or Publication Title:Proceedings of the Institution of Mechanical Engineers Part A: Journal of Power and Energy
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:229
DOI :10.1177/0957650915595898
Page Range:pp. 520-528
Publisher:SAGE Publications
Series Name:sage journals
ISSN:0957-6509
Status:Published
Keywords:Air-breathing engines, axial fans, axial flow compressors, compressor instability, compressors, fans, fans/blowers
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Pardowitz, Benjamin
Deposited On:11 Jan 2016 08:38
Last Modified:08 Mar 2018 18:27

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