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Journal of Visualization

, Volume 15, Issue 4, pp 333–341 | Cite as

The visualization of the acoustic feedback loop in impinging underexpanded supersonic jet flows using ultra-high frame rate schlieren

  • Daniel M. Mitchell
  • Damon R. Honnery
  • Julio Soria
Regular Paper

Abstract

The use of modern ultra-high speed cameras to acquire time-resolved schlieren image sequences of supersonic jet impingement is presented. The use of these cameras, with framerates of up to 1 million frames per second, allows for the first time-resolved visualizations of the impinging jet acoustic feedback loop. The role of upstream travelling acoustic waves in generating perturbations in the jet shear layer at the nozzle exit is also directly observed for the first time. The arrival of the acoustic wave at the nozzle lip generates a sinusoidal variation in density gradient that persists until a distance of \(\frac{x}{d}=0.3\). A structure that rapidly evolves into a large-scale vortex ring forms at the trailing edge of this initial instability, first observed at approximately \(\frac{x}{d}=0.25\).

Graphical abstract

Keywords

Aeroacoustics Schlieren Impinging Jet 

Notes

Acknowledgments

The authors would like to acknowledge the funding of the Australian Research Council in supporting this research.

Supplementary material

Supplementary material 1 (AVI 1,922 kb)

12650_2012_139_MOESM2_ESM.avi (2.4 mb)
Supplementary material 2 (AVI 2,419 kb)
12650_2012_139_MOESM3_ESM.rtf (29 kb)
Supplementary material 3 (RTF 29 kb)

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Copyright information

© The Visualization Society of Japan 2012

Authors and Affiliations

  • Daniel M. Mitchell
    • 1
  • Damon R. Honnery
    • 1
  • Julio Soria
    • 1
    • 2
  1. 1.Laboratory for Turbulence Research in Aerospace and Combustion, Department of Mechanical and Aerospace EngineeringMonash UniversityClaytonAustralia
  2. 2.Department of Aeronautical EngineeringKing Abdulaziz UniversityJeddahKingdom of Saudi Arabia

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