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Advanced Stereo High-Speed PIV in an Annular Cascade without Clearance: Evidences of Rotating Instability
Zitatschlüssel	2017_peter_12etc
Autor	Peter, J. and Pardowitz, B. and Eck, M. and Enghardt, L. and Peitsch, D. and Thamsen, P. U.
Seiten	ETC2017-205
Jahr	2017
ISSN	2410-4833
DOI	10.29008/ETC2017-205
Ort	Stockholm, Sweden
Journal	ETC - 12th European Conference on Turbomachinery Fluid dynamics & Thermodynamics
Monat	04
Notiz	Technische Universität Berlin: J. Peter, M. Eck, L. Enghardt, D. Peitsch, P. U. Thamsen German Aerospace Center (DLR), Berlin: B. Pardowitz, L. Enghardt
Herausgeber	European Turbomachinery Society (Euroturbo)
Wie herausgegeben	Creative Commons Attribution - NonCommercial - NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Zusammenfassung	Rotating Instability (RI) induces noise, triggers blade vibrations and is a potential indicator for critical operating conditions in axial compressors. Despite numerous studies, the source of RI is not completely understood. The objective of the present study is to give further insight into the basic mechanism of RI by means of advanced Stereo High-Speed Particle Image Velocimetry (PIV) applied to an annular compressor cascade without clearance. In particular, results of the PIV measurements visualize the predominant flow mechanism corresponding to RI. The experiments were conducted at an inflow Mach number of Ma = 0.4. Additional reference sensors captured the time-resolved pressure fluctuations synchronously to the optical measurements. By using correlation techniques between the PIV flow field and the reference sensor data, discrete vortex structures corresponding to the RI modes could be identified and localized. As a verification of the PIV results, the steady PIV flow velocity vectors are compared to results from an oil flow visualization technique. Overall, the present investigations point out that the general flow mechanism of RI is similar in compressor cascades with and without tip clearance.