The acoustic-particle velocity in the vicinity of a liner: a PIV - CAA comparison

Fischer, André; Bake, Friedrich; Bassetti, Alessandro

doi:10.2514/6.2013-2055

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…Ma, Slaboch & Morris (2009) also investigated the detailed fluid dynamic characteristics of a flow-excited Helmholtz resonator using PIV and proposed a predictive methodology for the corresponding measurements. Marx & Aurégan (2013) performed linear stability normal mode analysis of a lined wall with flow and the effect of viscous dissipation while Fischer, Bake & Bassetti (2013) performed a comparison between the PIV and computational aeroacoustic results in the vicinity of an acoustic liner, with phase-locked results, with encouraging agreement between a linearized boundary condition and the experimental data. A recent theoretical nonlinear Helmholtz model was developed by Singh & Rienstra (2014) to be applicability in the weakly nonlinear sound amplitude regime.…”

Section: Literature Reviewmentioning

confidence: 92%

Numerical investigation of a honeycomb liner grazed by laminar and turbulent boundary layers

Zhang

Bodony

2016

J. Fluid Mech.

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Direct numerical simulations are used to study the interaction of a cavity-backed circular orifice with grazing laminar and turbulent boundary layers and incident sound waves. The flow conditions and geometry are representative of single degree-of-freedom acoustic liners applied in the inlet and exhaust ducts of aircraft engines and are the same as those from experiments conducted at NASA Langley. The simulations identify the fluid mechanics of how the sound field and state of the grazing boundary layer impact the in-orifice flow and suggest a simple flow analogy that enables scaling estimates. From the scaling estimates the simulations are then used to develop reduced-order models for the in-orifice flow and a time-domain impedance model is constructed. The liner is found to increase drag at all conditions studied by an amount that increases with the incident sound pressure amplitude.

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Section: Literature Reviewmentioning

confidence: 92%

Numerical investigation of a honeycomb liner grazed by laminar and turbulent boundary layers

Zhang

Bodony

2016

J. Fluid Mech.

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“…Ma et al 18 also investigated the detailed fluid dynamic characteristics of a flow-excited Helmholtz resonator using PIV and proposed a predictive methodology for the corresponding measurements. Marx and Aurégan 19 performed linear stability normal mode analysis of a lined wall with flow and the effect of viscous dissipation while Fischer et al 20 performed a comparison between the PIV and computational aeroacoustic results in the vicinity of an acoustic liner, with phase-locked results, with encouraging agreement between a linearized boundary condition and the experimental data.…”

Section: Ia Literature Reviewmentioning

confidence: 86%

Direct numerical investigation of acoustic liners with single and multiple orifices grazed by a Mach 0.5 boundary layer

Zhang

Bodony

2016

46th AIAA Fluid Dynamics Conference

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Two groups of direct numerical simulations were conducted to investigate the interaction of a planar incident acoustic field with a cavity-backed circular orifice in the presence of a boundary layer with freestream Mach number of 0.5. The orifice-cavity geometry and grazing flow properties are extracted from a conventional single degree-of-freedom, locallyreacting liner tested at NASA Langley. This paper splits the discussions into two parts: the first part reports the results of single-orifice interaction with a temporal laminar/turbulent grazing boundary layer under the effect of planar acoustic incident sound. The second part moves to a more complicated but realistic liner model by increasing the number of the orifices over a single cavity and aims to investigate flow interactions between different orifices under a spatially-evolving laminar boundary layer. Both groups of the simulations predicts the impedance value with Dean's two-microphone method 1 . The normalized impedance value were scaled by the porosity of the liner and its validity is discussed.

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“…The SDOF liner principle allows a potentially high damping performance in a rather narrow frequency range (see e.g. [13,18,20,22,4,9]). A ZML liner consists of a perforated face sheet and a cavity below which is excited e.g.…”

Section: Hybrid Zero Massflow Linermentioning

confidence: 99%

Novel liner concepts

Bake

Knobloch

2019

CEAS Aeronaut J

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Modern, low emission aero-engine concepts like for instance Ultra-High-Bypass-Ratio (UHBR) designs claim higher demands on the damping performance of acoustic wall treatment, called liner, installed in the engine. New liner concepts are needed providing a more broadband damping efficiency ranging explicitly to the low frequency range. However, space and weight constrains are still also one of the crucial criteria which need to be fulfilled by the liner structure. To overcome this challenge two novel liner concepts are presented here. One concept, the hybrid ZML, combines the classical Single-Degree-Of-Freedom (SDOF) liner with a Zero-Massflow-Liner (ZML) principle. The other one, the FlexiS concept, takes advantage of the intrinsic material damping of flexible walls within the liner structure. A proof of concepts study of both novel concepts is provided highlighting the enhanced damping performance with respect to broadband capacity and low frequency damping.

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The acoustic-particle velocity in the vicinity of a liner: a PIV - CAA comparison

Cited by 4 publications

References 16 publications

Numerical investigation of a honeycomb liner grazed by laminar and turbulent boundary layers

Numerical investigation of a honeycomb liner grazed by laminar and turbulent boundary layers

Direct numerical investigation of acoustic liners with single and multiple orifices grazed by a Mach 0.5 boundary layer

Novel liner concepts

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