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Influence of Mach Number and Aerodynamic Loading on Rotating Instability in an Annular Compressor Cascade
Citation key 2012_beselt_asme
Author Beselt, C. and Peitsch, D.
Pages pp. 2711-2720, GT2012-69393
Year 2012
ISBN 978-0-7918-4474-8
DOI 10.1115/GT2012-69393
Location Copenhagen, Denmark
Journal ASME Turbo Expo 2012: Turbine Technical Conference and Exposition
Volume Volume 8: Turbomachinery, Parts A, B, and C
Month 06
Note Technische Universität Berlin:
C. Beselt, D. Peitsch
Editor ASME
Series Turbo Expo: Power for Land, Sea, and Air
Abstract An experimental study was conducted to investigate the influence of Mach number and aerodynamic loading on Rotating Instability (RI). Investigations were performed on an annular compressor cascade with radial clearance at the hub. In addition to steady flow field measurements, time resolved measurements of static wall-pressure at the hub, close to the tip clearance, were performed. For a specific range of incidence angles, RI could be detected at all flow speeds (Ma = 0.2–0.7). Shortly before the inception of RI, a sudden increase in pressure loss coefficient and outflow angle was detected by steady flow field measurements. The time resolved measurements showed an abruptly broadband increase of amplitude in the frequency range, in which RI occurs at higher loadings. RI propagates with 25–33% of the circumferential component of the upstream flow speed. Furthermore it is possible to scale the power spectral density function of the unsteady data with Strouhal number.
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