A review of CAA for fan duct propagation and radiation, with application to liner optimisation

Astley, R.J.; Sugimoto, Rie; Achunche, Iansteel; Kewin, M.F.; Mustafi, Prateek; Deane, E.

doi:10.1016/j.proeng.2010.09.016

Cited by 15 publications

(8 citation statements)

References 56 publications

(60 reference statements)

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“…The linearised Navier-Stokes equations may also support vorticity and entropy waves but these are not of primary interest here. A pragmatic alternative frequently employed has been to include the boundary layer in the impedance model and to assume that the flow is potential [2]. This is computational much lighter and is attractive particularly for inverse searches of liner impedance values from experimental data or large-scale design optimisations.…”

Section: A Wem-based Methodology For Computing the Propagation In A Lmentioning

confidence: 99%

“…The Myers boundary condition has been widely used to achieve numerical predictions of lined duct propagation [2,18], which are considered to be sufficiently accurate for engineering applications. However, there have been a number of studies in recent years, which have identified problems with Myers condition resulting from the modelling assumptions.…”

Section: A Wem-based Methodology For Computing the Propagation In A Lmentioning

confidence: 99%

“…Acoustic liners are used to absorb sound in many engineering applications, but particularly in aero-engines [1,2]. As aero-engines have become progressively larger in diameter, with the introduction of higher bypass-ratio flows, fan noise has become a prominent noise source.…”

Section: Introductionmentioning

confidence: 99%

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A wave expansion method for acoustic propagation in lined flow ducts

O’Reilly

2015

Applied Acoustics

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Acoustic liners are used extensively in engineering applications, particularly in aero-engines and automotive exhaust systems. In this paper, a flow impedance boundary conditions is introduced into the wave expansion method with the aim of providing an efficient methodology for computing the acoustic propagation through a lined duct with flow. For a potential flow, the boundary layer and the lined wall are included in the discretisation scheme by the Myers flow impedance boundary condition. The acoustic propagation through a flow-impedance tube is computed in order to validate the implementation of the impedance boundary condition in this scheme. The results show that this computationally light methodology provides generally good agreement with the experimental data.

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Section: A Wem-based Methodology For Computing the Propagation In A Lmentioning

confidence: 99%

Section: A Wem-based Methodology For Computing the Propagation In A Lmentioning

confidence: 99%

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A wave expansion method for acoustic propagation in lined flow ducts

O’Reilly

2015

Applied Acoustics

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“…Applications can be found in turbofan/turbomachinery (74)(75)(76) and environment control device (77) noise predictions. A more comprehensive review in this respect can be found in references (78)(79)(80)(81) .…”

Section: Noise Emissionmentioning

confidence: 99%

Review on ducted fans for compound rotorcraft

Zhang

Barakos

2020

Aeronaut. j.

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This paper presents a survey of published works on ducted fans for aeronautical applications. Early and recent experiments on full- or model-scale ducted fans are reviewed. Theoretical studies, lower-order simulations and high-fidelity CFD simulations are also summarised. Test matrices of several experimental and numerical studies are compiled and discussed. The paper closes with a summary of challenges for future ducted fan research.

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“…Sound generated by the rotor wake OGV interaction propagates through a swirling sheared flow between the rotor and OGV. Fan noise propagates through the flow in the engine inlet and in the bypass duct and is attenuated by the acoustic liners on the walls of these ducts [122]. As the engine size has grown with rated power and to accommodate higher bypass ratio, the length of the inlet duct has shrunk and thus the opportunity for attenuation by liners.…”

Section: (Iv) Fan and Turbomachinery Noisementioning

confidence: 99%

A second golden age of aeroacoustics?

Lele

Nichols

2014

Phil. Trans. R. Soc. A.

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In 1992, Sir James Lighthill foresaw the dawn of a second golden age in aeroacoustics enabled by computer simulations (Hardin JC, Hussaini MY (eds) 1993 Computational aeroacoustics, New York, NY: Springer (doi:10.1007). This review traces the progress in large-scale computations to resolve the noise-source processes and the methods devised to predict the far-field radiated sound using this information. Keeping focus on aviation-related noise sources a brief account of the progress in simulations of jet noise, fan noise and airframe noise is given highlighting the key technical issues and challenges. The complex geometry of nozzle elements and airframe components as well as the high Reynolds number of target applications require careful assessment of the discretization algorithms on unstructured grids and modelling compromises. High-fidelity simulations with 200-500 million points are not uncommon today and are used to improve scientific understanding of the noise generation process in specific situations. We attempt to discern where the future might take us, especially if exascale computing becomes a reality in 10 years. A pressing question in this context concerns the role of modelling in the coming era. While the sheer scale of the data generated by large-scale simulations will require new methods for data analysis and data visualization, it is our view that suitable theoretical formulations and reduced models will be even more important in future.

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A review of CAA for fan duct propagation and radiation, with application to liner optimisation

Cited by 15 publications

References 56 publications

A wave expansion method for acoustic propagation in lined flow ducts

A wave expansion method for acoustic propagation in lined flow ducts

Review on ducted fans for compound rotorcraft

A second golden age of aeroacoustics?

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