Microfluid dynamics and acoustics of resonant liners

Tam, Christopher K. W.; Kurbatskii, Konstantin A.

doi:10.2514/3.14554

Cited by 29 publications

(30 citation statements)

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“…In Ref. [3], visualization based on the simulation data demonstrated that vortex shedding was the dominant mechanism of acoustic dissipation at high incident sound level. At low SPL, viscous dissipation that took place at two oscillatory shear layers developed slightly off the walls at the opening of the resonator was responsible for the damping of incident sound.…”

Section: Discussionmentioning

confidence: 99%

“…One advantage of DNS is that the smallness of the resonator opening is not a hindrance to the investigation, as is the case with experimentation, and that the correct viscous effect can be reproduced in the computation. In Ref [3], it was found that for slit resonators with slit widths of 1 mm or less the flow around the slit was laminar even at incident sound-pressure-level (SPL) as high as 155 dB. The flow was totally dominated by vortex shedding.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Tam et al 3,4 initiated an effort to investigate the coupling between the flow and sound fields of resonant liners by direct numerical simulation (DNS). One advantage of DNS is that the smallness of the resonator opening is not a hindrance to the investigation, as is the case with experimentation, and that the correct viscous effect can be reproduced in the computation.…”

Section: Introductionmentioning

confidence: 99%

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A Computational and Experimental Study of Slit Resonators

Tam

Huang

Jones

et al. 2003

9th AIAA/CEAS Aeroacoustics Conference and Exhibit

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Computational and experimental studies are carried out to offer validation of the results obtained from direct numerical simulation (DNS) of the flow and acoustic fields of slit resonators. The test cases include slits with 90-degree corners and slits with 45-degree bevel angle housed inside an acoustic impedance tube. Three slit widths are used. Six frequencies from 0.5 to 3.0 kHz are chosen. Good agreement is found between computed and measured reflection factors. In addition, incident sound waves having a white noise spectrum and a prescribed pseudo-random noise spectrum are used in a subsequent series of tests. The computed broadband results are again found to agree well with experimental data. It is believed the present results provide strong support that DNS can eventually be a useful and accurate prediction tool for liner aeroacoustics. The usage of DNS as a design tool is discussed and illustrated by a simple example.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Computational and Experimental Study of Slit Resonators

Tam

Huang

Jones

et al. 2003

9th AIAA/CEAS Aeroacoustics Conference and Exhibit

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“…In contrast, the properties of the Helmholtz resonator have been obtained from the full equations in [6][7][8][9][10]16,17] but these are all fully CFD, DNS or LES simulations which do not give information for the simpler models.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear asymptotic impedance model for a Helmholtz resonator liner

Singh

Rienstra

2014

Journal of Sound and Vibration

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“…The nonlinear effect of high level acoustic excitation has for instance been studied in Ref. [1][2][3][4][5][6][7][8][9][10]. It is well known from this literature that perforates can become non-linear at fairly low acoustic excitation levels.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of an In-Duct Orifice with Bias Flow under Medium and High Level Acoustic Excitation

Zhou

Bodén

2014

International Journal of Spray and Combustion Dynamics

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This paper experimentally investigates the acoustic properties of an orifice with bias flow under medium and high sound level excitation. Orifices with two different edge configurations were tested. The study includes a wide range of bias flow velocities, various acoustic excitation levels and different frequencies. The nonlinear acoustic scattering matrix was identified by a finely controled two-source method. Aeroacoustic modal analysis was introduced based on eigenvaluedecomposition. Acoustic properties, such as impedance, nonlinear scattering matrix and the eigenvalues were compared and discussed. Experimental results also show that bias flow makes the acoustic properties more complex compared to the no bias flow case, especially when the velocity ratio between acoustic particle velocity and mean flow velocity is near unity.

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Microfluid dynamics and acoustics of resonant liners

Cited by 29 publications

References 0 publications

A Computational and Experimental Study of Slit Resonators

A Computational and Experimental Study of Slit Resonators

Nonlinear asymptotic impedance model for a Helmholtz resonator liner

Experimental Investigation of an In-Duct Orifice with Bias Flow under Medium and High Level Acoustic Excitation

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