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AN INVESTIGATION OF SONIC & SUPERSONIC AXISYMMETRIC JETS: CORRELATIONS BETWEEN FLOW PHYSICS AND FAR-FIELD NOISE

Andrew S. Magstadt
Dept. of Mechanical & Aerospace Engineering Syracuse University Syracuse, NY 13244

Matthew G. Berry
Dept. of Mechanical & Aerospace Engineering Syracuse University Syracuse, NY 13244

Zachary P. Berger
Department of Mechanical and Aerospace Engineering Syracuse University Syracuse, New York 13244, USA

Patrick R. Shea
Dept. of Mechanical & Aerospace Engineering Syracuse University Syracuse, NY 13244

Mark N. Glauser
Department of Mechanical and Aerospace Engineering Syracuse University Syracuse, NY 13244, USA

Christopher J. Ruscher
Spectral Energies, LLC. Dayton, OH 45431

Sivaram Gogineni
Spectral Energies, LLC. Dayton, OH 45431

Resumo

An axisymmetric convergent jet is studied at ideal and underexpanded conditions using velocity and acoustic data. Time-resolved and large-window PIV capture near-field velocities and are simultaneously sampled with far-field microphones. POD is used to extract modes representative of physical processes in the flow. Specifically, screechcontaining and turbulent mixing modes are isolated in the supersonic case. The decoupled velocity fields are then correlated with acoustic data to identify modes related to specific noise spectra. Finally, selective flow reconstruction is carried out to reduce flow features associated with an imperfectly expanded jet.