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The generation of screech tones by shock leakage

Published online by Cambridge University Press:  15 December 2020

Daniel Edgington-Mitchell Open the ORCID record for Daniel Edgington-Mitchell [Opens in a new window] ,
Joel Weightman Open the ORCID record for Joel Weightman [Opens in a new window] ,
Samuel Lock ,
Rhiannon Kirby ,
Vineeth Nair Open the ORCID record for Vineeth Nair [Opens in a new window] ,
Julio Soria Open the ORCID record for Julio Soria [Opens in a new window]  and
Damon Honnery
Daniel Edgington-Mitchell*
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, VIC3800, Australia
Joel Weightman
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, VIC3800, Australia
Samuel Lock
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, VIC3800, Australia
Rhiannon Kirby
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, VIC3800, Australia
Vineeth Nair
Affiliation:
Department of Aerospace Engineering, Indian Institute of Technology Bombay, Mumbai400076, India
Julio Soria
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, VIC3800, Australia
Damon Honnery
Affiliation:
Department of Mechanical and Aerospace Engineering, Monash University, VIC3800, Australia
*
†Email address for correspondence: [email protected]
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Abstract

The mechanism underpinning the generation of screech tones has remained an open question for many years. In this paper, direct experimental observations of the shock-leakage mechanism first proposed by Manning & Lele (AIAA Paper 1998, p. 282) are presented. Ultra-high-speed schlieren images are filtered to preserve only upstream-propagating components, with the upstream motion of the shock tip and subsequent emission of an acoustic wave visible for a number of operating conditions. The flow visualizations are supported by the ray-tracing model for shock leakage of Shariff & Manning (Phys. Fluids., vol. 25, issue 7, 2013, 076103), applied to velocity fields corresponding to a reconstructed screech cycle. The predictions of the model, when applied to real data, are in close agreement with the phenomena observed in the flow visualizations. It is demonstrated that shock leakage does not necessarily occur either at the point of maximum wave amplitude or maximum vorticity fluctuation. While the first point of shock leakage is shown to vary between cases, sound emission from multiple sources is observed for most cases considered. Finally, it is shown that variations in vortex strength captured in the velocity data are sufficient to explain variation in shock-leakage location observed in the flow visualization data.

JFM classification

Acoustics: Aeroacoustics Acoustics: Jet noise Aerodynamics: High-speed flow
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 908 , 10 February 2021 , A46
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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References

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Edgington-Mitchell et al. supplementary movie 1

Schlieren visualizations at 1MFps of shock leakage in a twin jet.

Download Edgington-Mitchell et al. supplementary movie 1(Video)
Video 1.1 MB

Edgington-Mitchell et al. supplementary movie 2

Various examples of schlieren visualizations at 1MFps of shock leakage in a twin jet.

Download Edgington-Mitchell et al. supplementary movie 2(Video)
Video 10.2 MB

Edgington-Mitchell et al. supplementary movie 3

Schlieren visualizations at 1MFps of shock leakage in the flapping mode of an axisymmetric jet.

Download Edgington-Mitchell et al. supplementary movie 3(Video)
Video 11.4 MB

Edgington-Mitchell et al. supplementary movie 4

Schlieren visualizations at 1MFps of shock leakage in the toroidal mode of an axisymmetric jet.

Download Edgington-Mitchell et al. supplementary movie 4(Video)
Video 668.9 KB

Edgington-Mitchell et al. supplementary movie 5

Various examples of schlieren visualizations at 1MFps of shock leakage in the toroidal mode of an axisymmetric jet.
Download Edgington-Mitchell et al. supplementary movie 5(Video)
Video 14.4 MB

Edgington-Mitchell et al. supplementary movie 6

Geometrical acoustics ray tracing predictions of shock leakage overlaid with Finite-Time Lyapunov Exponent contours.
Download Edgington-Mitchell et al. supplementary movie 6(Video)
Video 3.5 MB