Similarity scaling of jet noise sources for low-order jet noise modelling based on the Goldstein generalised acoustic analogy

Semiletov, Vasily; Karabasov, Sergey A.

doi:10.1177/1475472x17730457

Cited by 10 publications

(3 citation statements)

References 29 publications

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“…We will restrict ourselves to a brief summary here. Karabasov et al [107] and the follow-on studies (see [108,109] and references therein) adopted Goldstein's generalized acoustic analogy (GAA) [90], i.e. the Reynolds stress fluctuation covariances, enthalpy flux fluctuation covariances and the crosscovariances with the former, for modelling jet noise sources.…”

Section: (B) Trapped Acoustic Waves and Resonancementioning

confidence: 99%

Modelling of jet noise: a perspective from large-eddy simulations

Brès

Lele

2019

Phil. Trans. R. Soc. A.

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In the last decade, many research groups have reported predictions of jet noise using high-fidelity large-eddy simulations (LES) of the turbulent jet flow and these methods are beginning to be used more broadly. A brief overview of the publications since the review by Bodony & Lele (2008, AIAA J. 56 , 346–380) is undertaken to assess the progress and overall contributions of LES towards a better understanding of jet noise. In particular, we stress the meshing, numerical and modelling advances which enable detailed geometric representation of nozzle shape variations intended to impact the noise radiation, and sufficiently accurate capturing of the turbulent boundary layer at the nozzle exit. Examples of how LES is currently being used to complement experiments for challenging conditions (such as highly heated pressure-mismatched jets with afterburners) and guide jet modelling efforts are highlighted. Some of the physical insights gained from these numerical studies are discussed, in particular on crackle, screech and shock-associated noise, impingement tones, acoustic analogy models, wavepackets dynamics and resonant acoustic waves within the jet core. We close with some perspectives on the remaining challenges and upcoming opportunities for future applications. This article is part of the theme issue ‘Frontiers of aeroacoustics research: theory, computation and experiment’.

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Section: (B) Trapped Acoustic Waves and Resonancementioning

confidence: 99%

Modelling of jet noise: a perspective from large-eddy simulations

Brès

Lele

2019

Phil. Trans. R. Soc. A.

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“…The data of the heated and the cold CoJeN jet flows in the bypass/core share layers appear to collapse to two distinct families corresponding to two ratios of the convection velocity to the jet core velocity: U c /U j ∼ 0.6 for the cold jets and U c /U j ∼ 0.4 for the heated jets. The near perfect collapse of the convection and the local meanflow velocity, which happens for all jets except for the low-speed CoJeN case (OP1.1), suggests that the acoustic behaviour of the dual-stream jet flows along the outer aerodynamic radius is very much similar to that of single-stream jets [37].…”

Section: (C) Jet Flow Structure and Its Correlation Analysismentioning

confidence: 82%

Simulations of co-axial jet flows on graphics processing units: the flow and noise analysis

Markesteijn

Karabasov

2019

Phil. Trans. R. Soc. A.

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Large-eddy simulations (LES) are performed for a range of perfectly expanded co-axial jet cases corresponding to conditions of the computation of coaxial jet noise (CoJeN) experiment by QinetiQ. In all simulations, the high-resolution Compact Accurately Boundary-Adjusting high-REsolution Technique (CABARET) is used for solving the Navier–Stokes equations on unstructured meshes. The Ffowcs Williams–Hawkings method based on the penetrable integral surfaces is applied for far-field noise predictions. To correctly model the turbulent flow downstream of the complex nozzle that includes a central body, a wall modelled LES approach is implemented together with a turbulent inflow condition based on synthetic turbulence. All models are run on graphics processing units to enable a considerable reduction of the flow solution time in comparison with the conventional LES. The flow and noise solutions are validated against the experimental data available with 1–2 dB accuracy being reported for noise spectra predictions on the fine grid. To analyse the structure of effective noise sources of the jets, the covariance of turbulent fluctuating Reynolds stresses is computed and their characteristic scales are analysed in the context of the generalized acoustic analogy jet noise models. Motivated by self-similarity of single-stream axi-symmetric jet flows, a suitable non-dimensionalization of the effective jet noise sources of the CoJeN jets is tested, and its implications for low-order jet noise models are discussed. This article is part of the theme issue ‘Frontiers of aeroacoustics research: theory, computation and experiment’.

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“…The main purpose of this method is to gain better quantification and understand the nonjet noise components. Semiletov and Karabasov (2017) implemented a new low-order noise prediction scheme based on the Goldstein generalized acoustic analogy. A static isothermal jet is calculated using the large eddy simulation database of fluctuating Reynolds stress fields.…”

Section: Introductionmentioning

confidence: 99%

Effects of Porous Parameters on the Aerodynamic Noise of the Blowing Device of Guardrails

2022

JAFM

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To solve the problem of the strong noise generated in the galvanizing process on the surface of the guardrail board, optimal design of the outlet structure of the blowing device is carried out according to the sound absorption and noise reduction theory of microperforated plates. The aerodynamic characteristics and aerodynamic noise analysis of the blowing device are investigated by large eddy simulation with dynamic grid technology. The oblique surface of the outlet is processed with blind holes, and then the influence of blind holes on the aerodynamic noise of the blowing device is explored, including different shapes, porosities and depths. The spectral study reveals that when the guardrail board just enters the blowing device, there is greater noise compared to other working conditions. The place with the highest noise sound pressure level (SPL) is at the outlet of the blowing device at the monitoring point of R=1 m and the direction of 90°. The SPLs of the monitoring points at 0° and 180° are smaller than those in other directions, while the SPL distribution of the monitoring points in other directions is relatively even. Compared with the original blowing device, the best noise reduction performance is achieved when the blowing device has cylindrical holes, with a porosity of 10% and a hole depth of 3 mm. The noise reduction value reaches up to 28.4 dB. In addition, an aerodynamic noise test was carried out on the blowing device in the corrugated board galvanizing workshop to demonstrate the correctness of the results of the numerical simulation.

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Similarity scaling of jet noise sources for low-order jet noise modelling based on the Goldstein generalised acoustic analogy

Cited by 10 publications

References 29 publications

Modelling of jet noise: a perspective from large-eddy simulations

Modelling of jet noise: a perspective from large-eddy simulations

Simulations of co-axial jet flows on graphics processing units: the flow and noise analysis

Effects of Porous Parameters on the Aerodynamic Noise of the Blowing Device of Guardrails

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