A Time-Domain Method for the Prediction of Sound Attenuation in Lined Ducts

Sbardella, L.; Tester, Brian J.; Imregun, M.

doi:10.1006/jsvi.2000.3173

Cited by 28 publications

(20 citation statements)

References 11 publications

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“…More than 10 years ago, Sbardella et al 6 proposed an alternative method to implement the standard Helmholtz resonator model. This method consists in modeling the resistive sheet by an impedance condition but now the cavities belong to the computational domain.…”

Section: Introductionmentioning

confidence: 99%

“…This is due to the fact that this method assumes a frequency invariant resistance of the impedance model. This paper is intended to extend the method of Sbardella et al 6 by giving it the capacity of implementing the EHR impedance model. We believe that this method might be an interesting alternative to the standard implementation of EHR impedance model in time domain and might in some cases be easier to integrate in a CAA or CFD code.…”

Section: Introductionmentioning

confidence: 99%

“…Sections 2 and 3 review respectively the EHR impedance model and the method of Sbardella et al 6 Section 4 is devoted to the base-flow boundary layer developing on a liner. In Sec.…”

Section: Introductionmentioning

confidence: 99%

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A New Implementation of the Extended Helmholtz Resonator Acoustic Liner Impedance Model in Time Domain CAA

2016

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. The application of wall acoustic lining is a major factor in the reduction of aircraft engine noise. The extended Helmholtz Resonator (EHR) impedance model is widely used since it is representative of the behavior of realistic liners over a wide range of frequencies. Its application in time domain CAA methods by means of z-transform has been the subject of several papers. In contrast to standard liner modeling in time domain CAA, which consists in imposing a boundary condition modeling both the cavities and the perforated sheet of the liner, an alternative approach involves adding the cavities to the computational domain and imposing a condition between these cavities and the duct domain to model the resistive sheet. However, the original method may not be used for broadband acoustics since it implements an impedance condition with frequency independent resistance. This paper describes an extension of this method to implement the EHR impedance model in a time domain CAA method.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A New Implementation of the Extended Helmholtz Resonator Acoustic Liner Impedance Model in Time Domain CAA

2016

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“…They also illustrate the flow effects on the sound propagation inside the duct. In the literature, other techniques are used to model the duct system like the time domain method which was developed by (Özyörük, Long, 1996;Stanescu et al, 1999;Reichert, Biringen, 1997) and (Sbardella et al, 2001) because of its lowcost computing power and the frequency-domain methods by (McAlpine, Fisher, 2003) and (Özyörük et al, 2004) which are also used because they are much faster. Also, we note some works presenting optimization methods for duct systems such as the works of (Chiu, 2009) and (Chang, Chiu, 2010) to optimize multi-mufflers flow ducts using, respectively, the simulated annealing technique.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of the Acoustic Pressure Inside an Axisymmetric Lined Flow Duct

Taktak¹,

Majdoub²,

Bentahar³

et al. 2012

Archives of Acoustics

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Numerical methods are mostly used to predict the acoustic pressure inside duct systems. In this paper, the development of a numerical method based on the convected Helmholtz equation to compute the acoustic pressure inside an axisymmetric duct is presented. A validation of the proposed method was done by a comparison with the analytical formulation for simple cases of hard wall and lined ducts. The effect of the flow on the acoustic pressure inside these ducts was then evaluated by computing this field with different Mach numbers.

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“…Sbardella et al 7 proposed a time-domain liner model, which combines a frequency-independent resistive part and a reactive part. Tam et al 8 carried out time-domain direct numerical simulation of a single liner and showed that vortex shedding is the dominant mechanism of absorption for incident waves of high amplitude.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Acoustic Damping of Plane Acoustic Waves by Perforated Liners With Bias Flow

Zhao

Zhong

2012

Int. J. Mod. Phys. Conf. Ser.

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Perforated liners are extensively used in aero-engines and gas turbine combustors to suppress combustion instabilities. These liners, typically subjected to a low Mach number bias flow (a cooling flow through perforated holes), are fitted along the bounding walls of a combustor to convert acoustic energy into flow energy by generating vorticity at the rims of the perforated apertures. To investigate the acoustic damping of such liners with bias flow on plane acoustic waves, a time-domain numerical model is developed to compute acoustic wave propagation in a cylindrical duct with a single-layer liner attached. The damping mechanism of the liner is characterized in real-time by using a 'compliance', developed especially for this work. It is a rational function representation of the frequency-domain homogeneous compliance adapted from the Rayleigh conductivity of a single aperture with mean bias flow in the z-domain. The liner 'compliance' model is then incorporated into partial differential equations of the duct system, which are solved by using the method of lines. The numerical results are then evaluated by comparing with the numerical results of Eldredge and Dowling's frequency-domain model. Good agreement is observed. This confirms that the model and the approach developed are suitable for real-time characterizing the acoustic damping of perforated liners.

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A Time-Domain Method for the Prediction of Sound Attenuation in Lined Ducts

Cited by 28 publications

References 11 publications

A New Implementation of the Extended Helmholtz Resonator Acoustic Liner Impedance Model in Time Domain CAA

A New Implementation of the Extended Helmholtz Resonator Acoustic Liner Impedance Model in Time Domain CAA

Numerical Modelling of the Acoustic Pressure Inside an Axisymmetric Lined Flow Duct

Numerical Investigation of the Acoustic Damping of Plane Acoustic Waves by Perforated Liners With Bias Flow

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