Effect of Grazing–bias Flow Interaction on Acoustic Impedance of Perforated Plates

Sun, Xiaofeng; Ji, Xiaodong; Zhang, H.; Shi, Yuanyuan

doi:10.1006/jsvi.2001.4110

Cited by 73 publications

(41 citation statements)

References 23 publications

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“…Typical configurations involve a mean flow through the plate (bias flow) and a crossflow tangential to the plate on each side of it (grazing flow). Some existing models include the presence of bias flow through the plate (Howe, 1979;Hughes and Dowling, 1990;Jing et al, 2001;Howe et al, 1997;Sun et al, 2002;Bellucci et al, 2004;Luong et al, 2005). Among them, some also account for the grazing flow (Jing et al, 2001;Howe et al, 1997;Sun et al, 2002).…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Acoustic modeling of perforated plates with bias flow for Large-Eddy Simulations

Mendez

Eldredge

2009

Journal of Computational Physics

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The study of the acoustic effect of perforated plates by Large-Eddy Simulations is reported. The ability of compressible Large-Eddy Simulations to provide data on the flow around a perforated plate and the associated acoustic damping is demonstrated. In particular, assumptions of existing models of the acoustic effect of perforated plate are assessed thanks to the Large-Eddy Simulations results. The question of modeling the effect of perforated plates is then addressed in the context of thermoacoustic instabilities of gas turbine combustion chambers. Details are provided about the implementation, validation and application of a homogeneous boundary condition modeling the acoustic effect of perforated plates for compressible Large-Eddy Simulations of the flow in combustions chambers cooled by full-coverage film cooling.

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Section: Introduction and Objectivesmentioning

confidence: 99%

Acoustic modeling of perforated plates with bias flow for Large-Eddy Simulations

Mendez

Eldredge

2009

Journal of Computational Physics

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“…7,[14][15][16] An exception is the work of Sun et al, 17 which experimentally characterized the impedance of a single orifice in a plate for a variety of grazing and bias flow velocities. They attempted to correlate their results with an empirical model for the discharge coefficient, which they then related to the acoustic resistance of the orifice.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Acoustic Behavior of a Multi-Perforated Liner

Eldredge

Bodony

Shoeybi

2007

13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference)

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The acoustic response of a turbulent flow through an aperture in a multi-perforated liner is computed with incompressible large-eddy simulation (LES). The effect of a large array of apertures is accounted for by simulating a single jet with periodic conditions in both directions tangential to the liner. Turbulent grazing flows are included in the regions above and below the aperture, which is tilted in the tangential flow direction as in practical film cooling liners. The mass flow through the aperture is modulated with a small sinusoidal perturbation superposed on a mean component. The acoustic response is determined by measuring the fluctuating pressure difference across the aperture that results from forcing at a range of different frequencies. The Rayleigh conductivity of the aperture, which is related to the acoustic impedance of the liner, is calculated at each frequency. Good agreement is found when compared with existing theory, when the latter is modified in ad hoc fashion for the thickness and tilting of the aperture. The behavior of the flow inside the aperture and its relationship to the acoustic response are discussed.

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“…Several interactions between the flow emanating from the resonator neck, which is crossing the grazing flow in the enclosure, are possible. High Mach number grazing flow affect the discharge coefficient [17] as well as the virtual neckextension because the trajectory of the emanating jet is influenced.…”

mentioning

confidence: 99%

“…The pressure loss-coefficient that accounts for the free jet dissipation at the area changes at the resonator neck, is connected to the discharge coefficient, which describes the ratio of the effective jet diameter and the vicinity. It is mainly influenced by the geometry and the local flow field [16,17]. Howe [18] introduced an analytical approach for the calculation of the discharge coefficient and the virtual neck-extension of a thin orifice by providing a complex valued expression of the Rayleigh conductivity, which mainly depends on the Strouhal number.…”

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confidence: 99%