Trailing edge serrations: Effect of their flap angle on flow and acoustics

Carlos Arce Leon; Roberto Merino Martinez; Daniele Ragni; Stefan Pröbsting; Francesco Avallone; A. Singh; Jesper Madsen

Trailing edge serrations: Effect of their flap angle on flow and acoustics

Carlos Arce Leon, Roberto Merino Martinez, Daniele Ragni, Stefan Pröbsting, Francesco Avallone, A. Singh, Jesper Madsen

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Abstract

Trailing edge serrations have been proven to work as a passive noise reduction device. Nevertheless, they have also previously been found to increase noise in a particular frequency range, argued in earlier research to be due to the misalignment of the serrations with the direction of the flow in the wake. It emerges as a high-frequency noise increase in a broadband region of the spectrum. This study investigates the effect of serration-flow misalignment on the noise emissions using acoustic beamforming, and finds a correlation with observations made on the flow using particle image velocimetry (PIV). The hydrodynamic source of the noise increase is hereby identified, and a Strouhal number relation for the high-frequency noise increase is proposed

Original language	English
Title of host publication	7th International Conference on Wind Turbine Noise
Subtitle of host publication	Rotterdam – 2nd to 5th May 2017
Number of pages	16
Publication status	Published - 2017
Event	7th International Conference on Wind Turbine Noise: Wind Turbine Noise 2017 - Willem Burger Complex, Rotterdam, Netherlands Duration: 2 May 2017 → 5 May 2017 Conference number: 7 https://www.windturbinenoise.eu/content/conferences/1-wind-turbine-noise-2017/

Conference

Conference	7th International Conference on Wind Turbine Noise
Country/Territory	Netherlands
City	Rotterdam
Period	2/05/17 → 5/05/17
Internet address	https://www.windturbinenoise.eu/content/conferences/1-wind-turbine-noise-2017/

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Trailing Edge Serrations - Effect of Their Flap AngleSubmitted manuscript, 2.5 MB

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@inproceedings{73a62aacc5024791917b38ad2d0cccf5,

title = "Trailing edge serrations: Effect of their flap angle on flow and acoustics",

abstract = "Trailing edge serrations have been proven to work as a passive noise reduction device. Nevertheless, they have also previously been found to increase noise in a particular frequency range, argued in earlier research to be due to the misalignment of the serrations with the direction of the flow in the wake. It emerges as a high-frequency noise increase in a broadband region of the spectrum. This study investigates the effect of serration-flow misalignment on the noise emissions using acoustic beamforming, and finds a correlation with observations made on the flow using particle image velocimetry (PIV). The hydrodynamic source of the noise increase is hereby identified, and a Strouhal number relation for the high-frequency noise increase is proposed",

author = "{Arce Leon}, Carlos and {Merino Martinez}, Roberto and Daniele Ragni and Stefan Pr{\"o}bsting and Francesco Avallone and A. Singh and Jesper Madsen",

year = "2017",

language = "English",

booktitle = "7th International Conference on Wind Turbine Noise",

note = "7th International Conference on Wind Turbine Noise : Wind Turbine Noise 2017 ; Conference date: 02-05-2017 Through 05-05-2017",

url = "https://www.windturbinenoise.eu/content/conferences/1-wind-turbine-noise-2017/",

}

TY - GEN

T1 - Trailing edge serrations

T2 - 7th International Conference on Wind Turbine Noise

AU - Arce Leon, Carlos

AU - Merino Martinez, Roberto

AU - Ragni, Daniele

AU - Pröbsting, Stefan

AU - Avallone, Francesco

AU - Singh, A.

AU - Madsen, Jesper

N1 - Conference code: 7

PY - 2017

Y1 - 2017

N2 - Trailing edge serrations have been proven to work as a passive noise reduction device. Nevertheless, they have also previously been found to increase noise in a particular frequency range, argued in earlier research to be due to the misalignment of the serrations with the direction of the flow in the wake. It emerges as a high-frequency noise increase in a broadband region of the spectrum. This study investigates the effect of serration-flow misalignment on the noise emissions using acoustic beamforming, and finds a correlation with observations made on the flow using particle image velocimetry (PIV). The hydrodynamic source of the noise increase is hereby identified, and a Strouhal number relation for the high-frequency noise increase is proposed

AB - Trailing edge serrations have been proven to work as a passive noise reduction device. Nevertheless, they have also previously been found to increase noise in a particular frequency range, argued in earlier research to be due to the misalignment of the serrations with the direction of the flow in the wake. It emerges as a high-frequency noise increase in a broadband region of the spectrum. This study investigates the effect of serration-flow misalignment on the noise emissions using acoustic beamforming, and finds a correlation with observations made on the flow using particle image velocimetry (PIV). The hydrodynamic source of the noise increase is hereby identified, and a Strouhal number relation for the high-frequency noise increase is proposed

UR - http://resolver.tudelft.nl/uuid:73a62aac-c502-4791-917b-38ad2d0cccf5

M3 - Conference contribution

BT - 7th International Conference on Wind Turbine Noise

Y2 - 2 May 2017 through 5 May 2017

ER -

Trailing edge serrations: Effect of their flap angle on flow and acoustics

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