Pressure radiation from a perforated duct exit region

Honglin Wang; Alan, E Vardy; Dubravka  Pokrajac

doi:10.1016/j.jsv.2015.03.040

Pressure radiation from a perforated duct exit region

Honglin Wang
, Alan, E Vardy (Lead / Corresponding author)
, Dubravka Pokrajac

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Abstract

The influence of a perforated extension region on pressures radiated from the end of a duct is studied numerically using CFD. Planar 2-D geometry is considered and particular attention is paid to the case of pressure disturbances radiated from railway tunnels in cut-and-cover regions. The mechanism that causes this behaviour is described and it is shown to have an important influence of the effectiveness of a perforated extension region. It is found that such regions can strongly reduce the pressures radiated from a duct outlet, but that this benefit is offset by pressures radiated directly from the holes along the perforated region itself. In the particular case of tunnel design, practical studies of wave transmission are usually based on 1-D, plane-wave, analyses. Accordingly, attention is paid to assessing the limitations of such approaches in the case of wave propagation along a perforated region.

Original language	English
Pages (from-to)	29-42
Number of pages	14
Journal	Journal of Sound and Vibration
Volume	351
Early online date	16 May 2015
DOIs	https://doi.org/10.1016/j.jsv.2015.03.040
Publication status	Published - 1 Sept 2015

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Cite this

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title = "Pressure radiation from a perforated duct exit region",

abstract = "The influence of a perforated extension region on pressures radiated from the end of a duct is studied numerically using CFD. Planar 2-D geometry is considered and particular attention is paid to the case of pressure disturbances radiated from railway tunnels in cut-and-cover regions. The mechanism that causes this behaviour is described and it is shown to have an important influence of the effectiveness of a perforated extension region. It is found that such regions can strongly reduce the pressures radiated from a duct outlet, but that this benefit is offset by pressures radiated directly from the holes along the perforated region itself. In the particular case of tunnel design, practical studies of wave transmission are usually based on 1-D, plane-wave, analyses. Accordingly, attention is paid to assessing the limitations of such approaches in the case of wave propagation along a perforated region.",

author = "Honglin Wang and Vardy, \{Alan, E\} and Dubravka Pokrajac",

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T1 - Pressure radiation from a perforated duct exit region

AU - Wang, Honglin

AU - Vardy, Alan, E

AU - Pokrajac, Dubravka

PY - 2015/9/1

Y1 - 2015/9/1

N2 - The influence of a perforated extension region on pressures radiated from the end of a duct is studied numerically using CFD. Planar 2-D geometry is considered and particular attention is paid to the case of pressure disturbances radiated from railway tunnels in cut-and-cover regions. The mechanism that causes this behaviour is described and it is shown to have an important influence of the effectiveness of a perforated extension region. It is found that such regions can strongly reduce the pressures radiated from a duct outlet, but that this benefit is offset by pressures radiated directly from the holes along the perforated region itself. In the particular case of tunnel design, practical studies of wave transmission are usually based on 1-D, plane-wave, analyses. Accordingly, attention is paid to assessing the limitations of such approaches in the case of wave propagation along a perforated region.

AB - The influence of a perforated extension region on pressures radiated from the end of a duct is studied numerically using CFD. Planar 2-D geometry is considered and particular attention is paid to the case of pressure disturbances radiated from railway tunnels in cut-and-cover regions. The mechanism that causes this behaviour is described and it is shown to have an important influence of the effectiveness of a perforated extension region. It is found that such regions can strongly reduce the pressures radiated from a duct outlet, but that this benefit is offset by pressures radiated directly from the holes along the perforated region itself. In the particular case of tunnel design, practical studies of wave transmission are usually based on 1-D, plane-wave, analyses. Accordingly, attention is paid to assessing the limitations of such approaches in the case of wave propagation along a perforated region.

U2 - 10.1016/j.jsv.2015.03.040

DO - 10.1016/j.jsv.2015.03.040

M3 - Article

SN - 0022-460X

VL - 351

SP - 29

EP - 42

JO - Journal of Sound and Vibration

JF - Journal of Sound and Vibration

ER -

Pressure radiation from a perforated duct exit region

Abstract

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