Flow Structures Associated with Turbulent Mixing Noise and Screech Tones in Axisymmetric Jets

Andrew S. Magstadt, Matthew G. Berry, Zachary P. Berger, Patrick R. Shea, Christopher J. Ruscher, Sivaram P. Gogineni, Mark N. Glauser

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


A jet from an axisymmetric convergent nozzle is studied at ideal and underexpanded conditions using velocity and acoustic data. Two particle imaging velocimetry setups, a 10 kHz system and a multi-camera configuration, were used to capture near-field velocities while simultaneously sampled with far-field microphones. Proper orthogonal decomposition is performed on the velocity data to extract modes representative of physical processes in the flow. The decomposed velocity fields are then correlated with acoustic data to identify modes related to specific noise spectra. Specifically, four modes are associated with noise production in the sonic plume. Selective flow-field reconstruction is carried out, revealing interesting dynamics associated with loud flow states. In the supersonic case, screech-containing and turbulent mixing modes are isolated. The spatial modes of each data set are then compared for similarities in structures.

Original languageEnglish (US)
Pages (from-to)725-750
Number of pages26
JournalFlow, Turbulence and Combustion
Issue number3
StatePublished - 2017

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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