TY - GEN
T1 - A near-field investigation of a supersonic, multi-stream jet
T2 - 54th AIAA Aerospace Sciences Meeting, 2016
AU - Magstadt, Andrew S.
AU - Berry, Matthew G.
AU - Coleman, Thomas J.
AU - Shea, Patrick R.
AU - Glauser, Mark N.
AU - Ruscher, Christopher J.
AU - Gogineni, Sivaram
AU - Kiel, Barry V.
N1 - Funding Information:
The authors would like to acknowledge two funding sources: 1) a SBIR Phase I & II project with Spectral Energies, LLC. and the AFRL turbine engine division under the direction of Dr. Barry Kiel, and 2) an AFOSR grant, number FA9550-15-1-0435, under the guidance of Dr. R. Ponnappan, Program Manager. Additionally, the authors would like to thank Professor Jacques Lewalle and Graduate Student Andrew Tenney of Syracuse University for their help with data analysis and insightful conversations. Daniel Edgington- Mitchel of Monash University provided very helpful advice on the schlieren setup, so thanks are given to him. Finally, the personnel at AFRL are greatly appreciated, including Dr. Alex Giese (Turbine Engine Division) for his insight into propulsion systems, Ms. Amy Lynch (Combustion Branch) who graciously loaned SU the mirrors, Dr. James Gord, for lending the high-speed camera, and Dr. Ben Halls (NRC Post-doc Associate) for his advice on camera operation. In accordance with DoD Directives, this information has been cleared for public release, ref. 88ABW-2015-5646.
Publisher Copyright:
© 2016, American Institute of Aeronautics and Astronautics Inc, AIAA . All rights reserved.
PY - 2016
Y1 - 2016
N2 - An experimental investigation into the flow-field of a modern jet nozzle has been carried out. Even in canonical flows (e.g. axisymmetric jets), turbulence and its consequences are not fully understood. For composite flows that are becoming more prevalent in the aerospace industry, the fluid mechanics have been studied even less sufficiently. The characteristics of a supersonic, complex, rectangular jet are therefore investigated via schlieren and PIV data. A large-window PIV system measures planar data, and a time-resolved schlieren instrument captures events of the flow at acquisition rates up to 400 kHz. As an initial investigation into this rich flow-field, the study focuses on probing the flow to find regions of interest, with particular attention given to identifying coherent structures, shear layers, and shock structures. Spectra of the data are computed and a dominant frequency of 34 kHz is universally identified throughout the experimental domain. Proper Orthogonal Decomposition (POD) is additionally used to extract coherent structures in the flow and to help explain where the unique signal may be coming from. Evidence is presented that suggest Kelvin-Helmholtz instabilities generated inside the nozzle may be forcing this high-frequency signal that is seen throughout the flow-field and in the far-field acoustics.
AB - An experimental investigation into the flow-field of a modern jet nozzle has been carried out. Even in canonical flows (e.g. axisymmetric jets), turbulence and its consequences are not fully understood. For composite flows that are becoming more prevalent in the aerospace industry, the fluid mechanics have been studied even less sufficiently. The characteristics of a supersonic, complex, rectangular jet are therefore investigated via schlieren and PIV data. A large-window PIV system measures planar data, and a time-resolved schlieren instrument captures events of the flow at acquisition rates up to 400 kHz. As an initial investigation into this rich flow-field, the study focuses on probing the flow to find regions of interest, with particular attention given to identifying coherent structures, shear layers, and shock structures. Spectra of the data are computed and a dominant frequency of 34 kHz is universally identified throughout the experimental domain. Proper Orthogonal Decomposition (POD) is additionally used to extract coherent structures in the flow and to help explain where the unique signal may be coming from. Evidence is presented that suggest Kelvin-Helmholtz instabilities generated inside the nozzle may be forcing this high-frequency signal that is seen throughout the flow-field and in the far-field acoustics.
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U2 - 10.2514/6.2016-1639
DO - 10.2514/6.2016-1639
M3 - Conference contribution
AN - SCOPUS:85007453173
SN - 9781624103933
T3 - 54th AIAA Aerospace Sciences Meeting
BT - 54th AIAA Aerospace Sciences Meeting
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
Y2 - 4 January 2016 through 8 January 2016
ER -