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Journal ArticleDOI

Oscillation Modes in Screeching Jets

Romain Gojon, +2 more
- 07 May 2018 - 
- Vol. 56, Iss: 7, pp 2918-2924
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TLDR
In this article, the origin of the oscillation modes of screeching round jets is investigated by assuming that the feedback part of the aeroacoustic loop responsible for screech noise can be modeled by considering the neutral acoustic wave modes of the equivalent ideally expanded jets.
Abstract
In this Note, the origin of the oscillation modes of screeching round jets is investigated by assuming that the feedback part of the aeroacoustic loop responsible for screech noise can be modeled by considering the neutral acoustic wave modes of the equivalent ideally expanded jets.

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Citations
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Journal ArticleDOI

Aeroacoustic resonance and self-excitation in screeching and impinging supersonic jets – A review:

TL;DR: In this paper, the signature of an aeroacoustic resonance loop established by a shock-containing jet is described, and the resonance loop can be used to identify the origin of high-intensity, discrete-frequency acoustic tones.
Journal ArticleDOI

Screech-tone prediction using upstream-travelling jet modes

TL;DR: In this article, a new prediction approach is proposed where the feedback loop is closed by the upstream-travelling jet modes first discussed in Tam and Hu (J Fluid Mech 201:447-483, 1989) in lieu of the free-stream sound waves.
Journal ArticleDOI

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

TL;DR: Assessment of the progress and overall contributions of LES towards a better understanding of jet noise stresses 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.
Journal ArticleDOI

Antisymmetric Oscillation Modes in Rectangular Screeching Jets

TL;DR: In this article, the origin and properties of the oscillation modes in screeching non-ideally expanded rectangular jets are investigated using compressible implicit LES of rectangular supersonic jets.
Journal ArticleDOI

Waves in screeching jets

TL;DR: In this paper, the authors considered the interaction between various wavelike structures in screeching jets via both experimental measurements and linear stability theory, and provided evidence that this wave is a duct-like mode similar to that recently identified in high subsonic jets by Towne et al.
References
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Journal ArticleDOI

A family of low dispersive and low dissipative explicit schemes for flow and noise computations

TL;DR: Explicit numerical methods for spatial derivation, filtering, and time integration are proposed in this article with the aim of computing flow and noise with high accuracy and fidelity, and they are constructed in the same way by minimizing the dispersion and the dissipation errors in the wavenumber space up to kΔx = π/2 corresponding to four points per wavelength.
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On the Mechanism of Choked Jet Noise

TL;DR: In this paper, the authors examined the noise in two-dimensional flow with the aid of a dynamic Schlieren apparatus, verifying the suggested mechanism and showing the similarity to axially symmetric flow where discontinuities in frequency, partly analogous to edge tones, occur.
Journal ArticleDOI

A shock-capturing methodology based on adaptative spatial filtering for high-order non-linear computations

TL;DR: A shock-capturing methodology is developed for non-linear computations using low-dissipation schemes and centered finite differences that allows in particular to distinguish shocks from linear waves, and from vortices when it is performed from dilatation rather than from pressure.
Journal ArticleDOI

Proposed relationship between broadband shock associated noise and screech tones

TL;DR: In this paper, the relationship between broadband shock associated noise and screech tones is examined and it is shown that from the spectral characteristics point of view, the screech tone may be regarded as a special case of broadband wave associated noise.
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