Koch, Werner (2009) Acoustic Resonances and Trapped Modes in Annular Plate Cascades. Journal of Fluid Mechanics, 628 (06), pp. 155-180. Cambidge University Press. doi: 10.1017/s0022112009006144. ISSN 0022-1120.
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Official URL: http://journals.cambridge.org
Abstract
As a stepping stone towards understanding acoustic resonances in axial flow compressors acoustic resonances are computed numerically in fixed single and tandem plate cascades in an infinitely long annular duct. Applying perfectly matched layer absorbing boundary conditions in the form of the complex scaling method of atomic and molecular physics to approximate the radiation condition the resonance problem is transformed into an eigenvalue problem. Of particular interest are resonances with zero radiation damping (trapped modes) or very small radiation damping (nearly trapped modes). Such resonances can be excited by wakes from compressor cascades or struts. If the shedding frequency is sufficiently close to an acoustic resonant frequency the latter may control the vortex shedding causing high intensity tonal noise or occasionally even blade failure. All resonances are computed for zero mean flow approximating low Mach number flows. The influence of various cascade parameters on the resonant frequencies is studied and, whenever possible, our numerical results are compared with published experimental findings.
Item URL in elib: | https://elib.dlr.de/55105/ | ||||||
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Document Type: | Article | ||||||
Title: | Acoustic Resonances and Trapped Modes in Annular Plate Cascades | ||||||
Authors: |
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Date: | June 2009 | ||||||
Journal or Publication Title: | Journal of Fluid Mechanics | ||||||
Refereed publication: | Yes | ||||||
Open Access: | No | ||||||
Gold Open Access: | No | ||||||
In SCOPUS: | Yes | ||||||
In ISI Web of Science: | Yes | ||||||
Volume: | 628 | ||||||
DOI : | 10.1017/s0022112009006144 | ||||||
Page Range: | pp. 155-180 | ||||||
Publisher: | Cambidge University Press | ||||||
ISSN: | 0022-1120 | ||||||
Status: | Published | ||||||
Keywords: | acoustic resonances, trapped modes, annular cascades, compressor acoustics | ||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||
HGF - Program: | Aeronautics | ||||||
HGF - Program Themes: | L VU - Air Traffic and Environment (old) | ||||||
DLR - Research area: | Aeronautics | ||||||
DLR - Program: | L VU - Air Traffic and Environment | ||||||
DLR - Research theme (Project): | L - Quiet Air Traffic (old), L - Fan and Compressor Technologies (old) | ||||||
Location: | Göttingen | ||||||
Institutes and Institutions: | Institute of Aerodynamics and Flow Technology > Helicopters | ||||||
Deposited By: | Winkels, Elisabeth | ||||||
Deposited On: | 09 Jul 2009 12:13 | ||||||
Last Modified: | 08 Mar 2018 18:42 |
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