TY - GEN
T1 - Upstream radiation from supersonic buried-nozzle jets via scattering at the shroud edge
AU - Samanta, Arnab
AU - Freund, Jonathan B.
N1 - Publisher Copyright:
© 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2016
Y1 - 2016
N2 - We investigate a scattering mechanism of upstream and sideline radiation from supersonic buried-nozzle jets, which for some conditions is comparable to the well-known, dominant downstream radiation from the Mach waves of such jets. In our buried-nozzle configuration, where the inner nozzle is buried within an outer nozzle-like shroud, the core inner nozzle jet is supersonic while the coflows are subsonic, with co-axial shear layers modeled as vortex sheets separating the respective jets. The mechanisms include incident perturbations in the form of tonal and multimodal shroud acoustic modes to scatter at the shroud edge and radiate sound waves. Depending upon the mix of acoustic modes in the incident perturbation, this radiation is shown to have the potential to generate a strong upstream component, comparable to the aft-angled Mach radiation.
AB - We investigate a scattering mechanism of upstream and sideline radiation from supersonic buried-nozzle jets, which for some conditions is comparable to the well-known, dominant downstream radiation from the Mach waves of such jets. In our buried-nozzle configuration, where the inner nozzle is buried within an outer nozzle-like shroud, the core inner nozzle jet is supersonic while the coflows are subsonic, with co-axial shear layers modeled as vortex sheets separating the respective jets. The mechanisms include incident perturbations in the form of tonal and multimodal shroud acoustic modes to scatter at the shroud edge and radiate sound waves. Depending upon the mix of acoustic modes in the incident perturbation, this radiation is shown to have the potential to generate a strong upstream component, comparable to the aft-angled Mach radiation.
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U2 - 10.2514/6.2015-2523
DO - 10.2514/6.2015-2523
M3 - Conference contribution
AN - SCOPUS:85088353574
SN - 9781624103674
T3 - 21st AIAA/CEAS Aeroacoustics Conference
BT - 21st AIAA/CEAS Aeroacoustics Conference
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - 21st AIAA/CEAS Aeroacoustics Conference, 2015
Y2 - 22 June 2015 through 26 June 2015
ER -