Excitation of subharmonic oscillations in an axisymmetric flow with coherent structures in the regime of aeroacoustic resonance |
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Authors: | S P Bardakhanov O V Belai |
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Institution: | (1) School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Sackville Street, PO Box 88, Manchester, M60 1QD, UK; |
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Abstract: | Conditions of origination of aeroacoustic resonance phenomena near an axisymmetric body in the form of a thick-walled tube
in an air flow in a rectangular channel are studied experimentally. Dependences of the eigenfrequency of acoustic oscillations
on the model length are determined. By studying the mechanism of origination of oscillations in the wake flow, it is shown
that the process of generation of annular coherent structures in resonant regimes is characterized by evolution of nonlinearities
including a subharmonic packet. Possible methods of flow control are discussed.
Institute of Theoretical and Applied Mechanics, Siberian Division, Russian Academy of Sciences, Novosibirsk 630090. Translated
from Prikladnaya Mekhanika i, Tekhnicheskaya Fizika, Vol. 41, No. 4, pp. 59–68, July–August, 2000. |
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