Noise cancellation for wall pressure fluctuations in measurements around a cylinder with laminar and turbulent flow separation
Noise cancellation for wall pressure fluctuations in measurements around a cylinder with laminar and turbulent flow separation
This paper proposes two different noise cancellation techniques for cleaning wall-pressure fluctuations signals. These fluctuations are measured around a circular cylinder with laminar and turbulent flow separation. The noise cancellation techniques are based on Wiener and adaptive filters and use the signals of pressure transducers mounted in a cross section of the cylinder and the signal of a free-field sensor opportunely located upstream. First, synthetic signals are used in order to validate the procedure. Then, both techniques are applied to the experimental data. Specific attention is paid to the filter order, optimized by a method introduced in this paper. Both filter types showed a selective behavior preserving the essence of the fluid dynamic phenomena characterizing the flow fields at each Reynolds number tested, especially when laminar separation occurs.
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Sardu, Costantino
ea602392-5353-4eb0-a451-80167b450376
Lasagna, Davide
0340a87f-f323-40fb-be9f-6de101486b24
Iuso, Gaetano
bddefee6-24c3-44fd-9b60-bec9ba1df95f
June 2016
Sardu, Costantino
ea602392-5353-4eb0-a451-80167b450376
Lasagna, Davide
0340a87f-f323-40fb-be9f-6de101486b24
Iuso, Gaetano
bddefee6-24c3-44fd-9b60-bec9ba1df95f
Sardu, Costantino, Lasagna, Davide and Iuso, Gaetano
(2016)
Noise cancellation for wall pressure fluctuations in measurements around a cylinder with laminar and turbulent flow separation.
Journal of Fluids Engineering, 138 (6), .
(doi:10.1115/1.4032034).
Abstract
This paper proposes two different noise cancellation techniques for cleaning wall-pressure fluctuations signals. These fluctuations are measured around a circular cylinder with laminar and turbulent flow separation. The noise cancellation techniques are based on Wiener and adaptive filters and use the signals of pressure transducers mounted in a cross section of the cylinder and the signal of a free-field sensor opportunely located upstream. First, synthetic signals are used in order to validate the procedure. Then, both techniques are applied to the experimental data. Specific attention is paid to the filter order, optimized by a method introduced in this paper. Both filter types showed a selective behavior preserving the essence of the fluid dynamic phenomena characterizing the flow fields at each Reynolds number tested, especially when laminar separation occurs.
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Accepted/In Press date: 15 November 2015
e-pub ahead of print date: 8 January 2016
Published date: June 2016
Organisations:
Aerodynamics & Flight Mechanics Group
Identifiers
Local EPrints ID: 385457
URI: http://eprints.soton.ac.uk/id/eprint/385457
ISSN: 0098-2202
PURE UUID: 6d122901-53b5-4d20-a2ce-176cb78e765b
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Date deposited: 20 Jan 2016 09:29
Last modified: 15 Mar 2024 03:47
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Author:
Costantino Sardu
Author:
Gaetano Iuso
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