Deterministic Model of AcousticWave Propagation in a Cavity

Colin van Dercreek; Pieter Sijtsma; Mirjam Snellen; Daniele Ragni; Francesco Avallone; Dick Simons

doi:10.2514/6.2019-2425

Deterministic Model of AcousticWave Propagation in a Cavity

Colin van Dercreek, Pieter Sijtsma, Mirjam Snellen, Daniele Ragni, Francesco Avallone, Dick Simons

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

3 Citations (Scopus)

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Abstract

A mathematical model is proposed that evaluates acoustic propagation of turbulent boundary layer waves on top of a cavity enclosing a microphone. The goal is to optimize these cavity geometries to improve the signal-to-noise ratio of acoustic measurements. This model predicts the attenuation of the turbulent boundary layer fluctuations propagating within the cavity for a given wind tunnel speed, porous surface resistance and cavity geometry. Duct acoustics predict that the spatial wave numbers of the turbulent boundary layer pressure fluctuations are shorter than the acoustic wavelength and are therefore evanescent in the cavity. These cavities are also covered with a porous material such as a metallic mesh or kevlar, to attenuate hydrodynamic fluctuations through the cavity. This model supports the investigation of 3D cylindrical cavities and incorporates both soft and hard cavity walls. Good agreement was found with experimental data.

Original language	English
Title of host publication	25th AIAA/CEAS Aeroacoustics Conference
Subtitle of host publication	20-23 May 2019 Delft, The Netherlands
Number of pages	15
ISBN (Electronic)	978-1-62410-588-3
DOIs	https://doi.org/10.2514/6.2019-2425
Publication status	Published - 2019
Event	25th AIAA/CEAS Aeroacoustics Conference - Delft, Netherlands Duration: 20 May 2019 → 23 May 2019 Conference number: 25 https://arc.aiaa.org/doi/book/10.2514/MAERO19

Conference

Conference	25th AIAA/CEAS Aeroacoustics Conference
Country/Territory	Netherlands
City	Delft
Period	20/05/19 → 23/05/19
Internet address	https://arc.aiaa.org/doi/book/10.2514/MAERO19

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6.2019-2425Final published version, 365 KB

Cite this

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title = "Deterministic Model of AcousticWave Propagation in a Cavity",

abstract = "A mathematical model is proposed that evaluates acoustic propagation of turbulent boundary layer waves on top of a cavity enclosing a microphone. The goal is to optimize these cavity geometries to improve the signal-to-noise ratio of acoustic measurements. This model predicts the attenuation of the turbulent boundary layer fluctuations propagating within the cavity for a given wind tunnel speed, porous surface resistance and cavity geometry. Duct acoustics predict that the spatial wave numbers of the turbulent boundary layer pressure fluctuations are shorter than the acoustic wavelength and are therefore evanescent in the cavity. These cavities are also covered with a porous material such as a metallic mesh or kevlar, to attenuate hydrodynamic fluctuations through the cavity. This model supports the investigation of 3D cylindrical cavities and incorporates both soft and hard cavity walls. Good agreement was found with experimental data. ",

author = "{van Dercreek}, Colin and Pieter Sijtsma and Mirjam Snellen and Daniele Ragni and Francesco Avallone and Dick Simons",

year = "2019",

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language = "English",

booktitle = "25th AIAA/CEAS Aeroacoustics Conference",

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T1 - Deterministic Model of AcousticWave Propagation in a Cavity

AU - van Dercreek, Colin

AU - Sijtsma, Pieter

AU - Snellen, Mirjam

AU - Ragni, Daniele

AU - Avallone, Francesco

AU - Simons, Dick

N1 - Conference code: 25

PY - 2019

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N2 - A mathematical model is proposed that evaluates acoustic propagation of turbulent boundary layer waves on top of a cavity enclosing a microphone. The goal is to optimize these cavity geometries to improve the signal-to-noise ratio of acoustic measurements. This model predicts the attenuation of the turbulent boundary layer fluctuations propagating within the cavity for a given wind tunnel speed, porous surface resistance and cavity geometry. Duct acoustics predict that the spatial wave numbers of the turbulent boundary layer pressure fluctuations are shorter than the acoustic wavelength and are therefore evanescent in the cavity. These cavities are also covered with a porous material such as a metallic mesh or kevlar, to attenuate hydrodynamic fluctuations through the cavity. This model supports the investigation of 3D cylindrical cavities and incorporates both soft and hard cavity walls. Good agreement was found with experimental data.

AB - A mathematical model is proposed that evaluates acoustic propagation of turbulent boundary layer waves on top of a cavity enclosing a microphone. The goal is to optimize these cavity geometries to improve the signal-to-noise ratio of acoustic measurements. This model predicts the attenuation of the turbulent boundary layer fluctuations propagating within the cavity for a given wind tunnel speed, porous surface resistance and cavity geometry. Duct acoustics predict that the spatial wave numbers of the turbulent boundary layer pressure fluctuations are shorter than the acoustic wavelength and are therefore evanescent in the cavity. These cavities are also covered with a porous material such as a metallic mesh or kevlar, to attenuate hydrodynamic fluctuations through the cavity. This model supports the investigation of 3D cylindrical cavities and incorporates both soft and hard cavity walls. Good agreement was found with experimental data.

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U2 - 10.2514/6.2019-2425

DO - 10.2514/6.2019-2425

M3 - Conference contribution

BT - 25th AIAA/CEAS Aeroacoustics Conference

T2 - 25th AIAA/CEAS Aeroacoustics Conference

Y2 - 20 May 2019 through 23 May 2019

ER -

Deterministic Model of AcousticWave Propagation in a Cavity

Abstract

Conference

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Improving Acoustic Measurements with Cavities in Closed Test Section Wind Tunnels

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