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

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-...

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Bibliographic Details
Published in:Flow, turbulence and combustion turbulence and combustion, 2017, Vol.98 (3), p.725-750
Main Authors: Magstadt, Andrew S., Berry, Matthew G., Berger, Zachary P., Shea, Patrick R., Ruscher, Christopher J., Gogineni, Sivaram P., Glauser, Mark N.
Format: Article
Language:English
Subjects:
Automotive Engineering
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Flow velocity
Fluid- and Aerodynamics
Heat and Mass Transfer
Noise spectra
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Summary: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.
ISSN:1386-6184
1573-1987
DOI:10.1007/s10494-016-9784-8