TY - JOUR
T1 - Flow Structures Associated with Turbulent Mixing Noise and Screech Tones in Axisymmetric Jets
AU - Magstadt, Andrew S.
AU - Berry, Matthew G.
AU - Berger, Zachary P.
AU - Shea, Patrick R.
AU - Ruscher, Christopher J.
AU - Gogineni, Sivaram P.
AU - Glauser, Mark N.
N1 - Publisher Copyright:
© 2016, Springer Science+Business Media Dordrecht.
PY - 2017
Y1 - 2017
N2 - 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.
AB - 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.
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U2 - 10.1007/s10494-016-9784-8
DO - 10.1007/s10494-016-9784-8
M3 - Article
AN - SCOPUS:84994384418
SN - 1386-6184
VL - 98
SP - 725
EP - 750
JO - Flow, Turbulence and Combustion
JF - Flow, Turbulence and Combustion
IS - 3
ER -