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Control of aerodynamic noise from cascade of flat plates by plasma actuators

Control of aerodynamic noise from cascade of flat plates by plasma actuators
Control of aerodynamic noise from cascade of flat plates by plasma actuators
At specific velocities, intense noise can be generated by the flow around a cascade of flat plates due to acoustic resonance. To reduce the aerodynamic noise, dielectric barrier discharge (DBD) plasma actuators (PAs) were utilized. The aim of this investigation was to clarify the control effects and the mechanism of noise reduction. To do this, wind tunnel experiments and computations were carried out for three vertically aligned flat plates. The PAs were mounted on both sides near the leading-edge of the vertically central flat plate. Moreover, to optimize the deployment of the operated PAs for control, PAs divided in the spanwise direction were utilized, where the PA was composed of 2 parts on each side. Experiments with various combinations of operated PAs were performed. The noise reduction achieved increases as the applied voltage of PAs increases. The maximum reduction of the tonal noise was 10.8 dB and was achieved by operating the whole array of PAs at a velocity of 13.5 m/s. The velocity profiles downstream of the PAs changed and the frequency of vortex shedding in the wake of the flat plate decreased with control of the PAs. The velocity corresponding to the maximum acoustic resonance was increased by operating the whole array of PAs. When the array of PAs are partially operated with a spanwise asymmetric deployment, it intensifies the three-dimensionality of the flow. Consequently, the acoustic radiation was weakened with a wider range of frequencies compared to the control by operating the whole array of PAs. The present results indicated that spatial asymmetry deployment is preferred to reduce aerodynamic noise.
1884-8346
1-16
Kusumoto, Makoto
652fc065-28a6-49d0-b4ec-89ff1d6dc875
Yokoyama, Hiroshi
06f86589-505c-400f-88bd-8ad9d9edbc62
Angland, David
b86880c6-31fa-452b-ada8-4bbd83cda47f
Iida, Akiyoshi
65965094-643a-4615-96cf-97a2a14b7954
Kusumoto, Makoto
652fc065-28a6-49d0-b4ec-89ff1d6dc875
Yokoyama, Hiroshi
06f86589-505c-400f-88bd-8ad9d9edbc62
Angland, David
b86880c6-31fa-452b-ada8-4bbd83cda47f
Iida, Akiyoshi
65965094-643a-4615-96cf-97a2a14b7954

Kusumoto, Makoto, Yokoyama, Hiroshi, Angland, David and Iida, Akiyoshi (2017) Control of aerodynamic noise from cascade of flat plates by plasma actuators Transactions of the Japan Society of Mechanical Engineers, 83, (847), pp. 1-16. (doi:10.1299/transjsme.16-00364).

Record type: Article

Abstract

At specific velocities, intense noise can be generated by the flow around a cascade of flat plates due to acoustic resonance. To reduce the aerodynamic noise, dielectric barrier discharge (DBD) plasma actuators (PAs) were utilized. The aim of this investigation was to clarify the control effects and the mechanism of noise reduction. To do this, wind tunnel experiments and computations were carried out for three vertically aligned flat plates. The PAs were mounted on both sides near the leading-edge of the vertically central flat plate. Moreover, to optimize the deployment of the operated PAs for control, PAs divided in the spanwise direction were utilized, where the PA was composed of 2 parts on each side. Experiments with various combinations of operated PAs were performed. The noise reduction achieved increases as the applied voltage of PAs increases. The maximum reduction of the tonal noise was 10.8 dB and was achieved by operating the whole array of PAs at a velocity of 13.5 m/s. The velocity profiles downstream of the PAs changed and the frequency of vortex shedding in the wake of the flat plate decreased with control of the PAs. The velocity corresponding to the maximum acoustic resonance was increased by operating the whole array of PAs. When the array of PAs are partially operated with a spanwise asymmetric deployment, it intensifies the three-dimensionality of the flow. Consequently, the acoustic radiation was weakened with a wider range of frequencies compared to the control by operating the whole array of PAs. The present results indicated that spatial asymmetry deployment is preferred to reduce aerodynamic noise.

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More information

Accepted/In Press date: 22 February 2017
e-pub ahead of print date: 2017
Organisations: Aerodynamics & Flight Mechanics Group

Identifiers

Local EPrints ID: 407888
URI: https://eprints.soton.ac.uk/id/eprint/407888
ISSN: 1884-8346
PURE UUID: 91a0cb43-2a03-42f1-aba8-544c5df06a23

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Date deposited: 28 Apr 2017 01:04
Last modified: 20 Dec 2017 17:31

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Contributors

Author: Makoto Kusumoto
Author: Hiroshi Yokoyama
Author: David Angland
Author: Akiyoshi Iida

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