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Passive control of flow-excited acoustic resonance in rectangular cavities using upstream mounted blocks

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Abstract

A passive method for controlling the flow-excited acoustic resonance resulting from subsonic flows over rectangular cavities in channels is investigated. A cavity with length to depth ratio of \(L/D=1\) is tested in air flow of Mach number up to 0.45. When the acoustic resonance is excited, the sound pressure level in the cavity reaches 162 dB. Square blocks are attached to the surface of the channel and centred upstream of the cavity leading edge to suppress the flow-excited acoustic resonance in the cavity. Six blocks of different widths are tested at three different upstream distances. The results show that significant attenuation of up to 30 dB of the excited sound pressure level is achieved using a block with a width to height ratio of 3, while blocks that fill the whole width of the channel amplify the pressure of the excited acoustic resonance. Moreover, it is found that placing the block upstream of the cavity causes the onset of the acoustic resonance to occur at higher flow velocities. In order to investigate the nature of the interactions that lead to suppression of the acoustic resonance and to identify the changes in flow patterns due to the placement of the block, 2D measurements of turbulence intensity in the shear layer and the block wake region are performed. The location of the flow reattachment point downstream of the block relative to the shear layer separation point has a major influence on the suppression level of the excited acoustic resonance. Furthermore, higher attenuation of noise is related to lower span-wise correlation of the shear-layer perturbation.

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Abbreviations

\(D\) :

Cavity depth

\(d\) :

Distance from cavity leading edge

\(f\) :

Frequency

\(h\) :

Block height

\(L\) :

Cavity length

\(l\) :

Characteristic shear-layer length

\(M\) :

Mach number

\(P\) :

Dynamic pressure

\(R\) :

Correlation coefficient

\(Re\) :

Reynolds number

\(St\) :

Strouhal number

\(U\) :

Flow velocity

\(u'\) :

Velocity perturbation

\(W\) :

Cavity width

\(w\) :

Block width

\(x,y,z\) :

Cartesian coordinates

\(\alpha\) :

Average convection speed

\(\theta\) :

Momentum thickness

\(\kappa\) :

Phase delay

\(\rho\) :

Density

\(\hbox {eff}\) :

Effective

\(\infty\) :

Inlet

\(\hbox {r}\) :

Reduced

\(\hbox {NB}\) :

No block

\(n,m\) :

Mode number

\(\hbox {re}\) :

Reattachment

\(*\) :

Normalized

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Acknowledgments

The authors thankfully acknowledge the financial support provided by the Natural Sciences and Engineering Research Council of Canada (NSERC).

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Authors and Affiliations

  1. Aeroacoustics and Noise Control Laboratory, Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, ON, Canada

    Mahmoud Shaaban & Atef Mohany

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  1. Mahmoud Shaaban
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  2. Atef Mohany
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Correspondence to Mahmoud Shaaban.

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Shaaban, M., Mohany, A. Passive control of flow-excited acoustic resonance in rectangular cavities using upstream mounted blocks. Exp Fluids 56, 72 (2015). https://doi.org/10.1007/s00348-015-1908-8

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  • DOI: https://doi.org/10.1007/s00348-015-1908-8

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