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Fluid dynamics of a flow excited resonance, part I: Experiment

Fluid dynamics of a flow excited resonance, part I: Experiment
Fluid dynamics of a flow excited resonance, part I: Experiment

This is the first of two companion papers concerned with the physics and detailed fluid dynamics of a flow excited resonance. The phenomenon has been examined by using a rather different approach from others to date, in which usually stability theory has been applied to small wave-like disturbances in an unstable shear layer with an equivalent source to describe the radiation of sound providing the feedback. The physics of the flow acoustic interaction is explained in terms of the detailed momentum and energy exchanges occurring in the fluid itself. Gross properties of the flow and resonance are described in terms of the parameters necessary to determine the behaviour of the self-oscillatory system. In this first paper a full experimental investigation of a flow excited Helmholtz resonator is described, in which the detailed fluid dynamical and acoustic data necessary to develop a mathematical model for the flow was obtained, and a new theory of the interaction process is presented in the companion paper (Part II). The investigation described involved the use of a two-component Laser-Doppler Velocimeter (L.D.V.) and probe microphones to specify completely the velocity and pressure fields and a flow visualization to give qualitative information of the vortex shedding process. The overall aim of the work described in the two papers was to increase fundamental understanding of flow/acoustic interactions.

0022-460X
15-38
Nelson, P. A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Halliwell, N. A.
f5ed3106-dbc5-4005-8b34-1186aed549e5
Doak, P. E.
4d613393-f1fd-4c9d-9df6-d76296d1b932
Nelson, P. A.
5c6f5cc9-ea52-4fe2-9edf-05d696b0c1a9
Halliwell, N. A.
f5ed3106-dbc5-4005-8b34-1186aed549e5
Doak, P. E.
4d613393-f1fd-4c9d-9df6-d76296d1b932

Nelson, P. A., Halliwell, N. A. and Doak, P. E. (1981) Fluid dynamics of a flow excited resonance, part I: Experiment. Journal of Sound and Vibration, 78 (1), 15-38. (doi:10.1016/S0022-460X(81)80156-3).

Record type: Article

Abstract

This is the first of two companion papers concerned with the physics and detailed fluid dynamics of a flow excited resonance. The phenomenon has been examined by using a rather different approach from others to date, in which usually stability theory has been applied to small wave-like disturbances in an unstable shear layer with an equivalent source to describe the radiation of sound providing the feedback. The physics of the flow acoustic interaction is explained in terms of the detailed momentum and energy exchanges occurring in the fluid itself. Gross properties of the flow and resonance are described in terms of the parameters necessary to determine the behaviour of the self-oscillatory system. In this first paper a full experimental investigation of a flow excited Helmholtz resonator is described, in which the detailed fluid dynamical and acoustic data necessary to develop a mathematical model for the flow was obtained, and a new theory of the interaction process is presented in the companion paper (Part II). The investigation described involved the use of a two-component Laser-Doppler Velocimeter (L.D.V.) and probe microphones to specify completely the velocity and pressure fields and a flow visualization to give qualitative information of the vortex shedding process. The overall aim of the work described in the two papers was to increase fundamental understanding of flow/acoustic interactions.

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More information

Published date: 8 September 1981
Additional Information: Funding Information: P. A. Nelson wishes to acknowledge the financial support of Sound Attenuators Limited, Colchester, throughout the period of this research work and the technical assistance of Mr A. Gomm in constructing the experimental apparatus. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.

Identifiers

Local EPrints ID: 457347
URI: http://eprints.soton.ac.uk/id/eprint/457347
ISSN: 0022-460X
PURE UUID: c85f3932-cf9d-4e63-a66e-1256ee2fe174
ORCID for P. A. Nelson: ORCID iD orcid.org/0000-0002-9563-3235

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Date deposited: 01 Jun 2022 16:45
Last modified: 19 Jul 2022 01:33

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Contributors

Author: P. A. Nelson ORCID iD
Author: N. A. Halliwell
Author: P. E. Doak

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