TY - GEN
T1 - Identifying coherent structures in a 3-stream supersonic jet flow using time-resolved schlieren imaging
AU - Tenney, Andrew
AU - Coleman, Thomas J.
AU - Lewalle, Jacques
AU - Ruscher, Christopher
AU - Glauser, Mark
AU - Gogineni, Sivaram
AU - Kiel, Barry
N1 - Funding Information:
This work would not have been possible without the convergence of multiple resources, for which we are grateful. The near-field analysis is supported in part by AFOSR grant number FA9550-15-1-0435, Dr. R. Ponnappan, Program Manager. The other support was provided by AFRL, Turbine Engineering Division, under an SBIR contract to Spectral Energies LLC. In particular, we appreciate the loan of mirrors from AFRL and camera from Spectral Energies, LLC. We also had partial support from Syracuse University, and benefited from extensive interactions with all members of the Glauser Group at Syracuse. Special thanks to Andy Magstadt and Matthew Berry for the long days and late nights spent in the lab to collect this data.
Publisher Copyright:
© 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All Rights Reserved.
PY - 2016
Y1 - 2016
N2 - We analyze time-resolved schlieren images of the near-field of a 3-stream supersonic jet. The primary jet operates in the vicinity of Ma = 1.6, and the images are collected at the rate of 50 to 400 kfps. We analyze transverse-axial images by constructing time series from more than 400 points selected for their possible significance, based on a qualitative analysis of the schlieren images. The points are grouped along the various shear layers and in the near-field outside the jet. We examine in turn the power spectra and cross-correlations between points. Overall qualitative and quantitative trends in both spectra and correlation are noted, revealing a strong dependence of both on transverse and axial location in the flow field. Defining features in the spectra give insight into the frequency bands which will be more closely analyzed in future phases of this study. The results from this preliminary study point to the validity of using time-resolved schlieren imaging as a non-intrusive experimental method to generate time series, to which a range of analysis methods is applicable.
AB - We analyze time-resolved schlieren images of the near-field of a 3-stream supersonic jet. The primary jet operates in the vicinity of Ma = 1.6, and the images are collected at the rate of 50 to 400 kfps. We analyze transverse-axial images by constructing time series from more than 400 points selected for their possible significance, based on a qualitative analysis of the schlieren images. The points are grouped along the various shear layers and in the near-field outside the jet. We examine in turn the power spectra and cross-correlations between points. Overall qualitative and quantitative trends in both spectra and correlation are noted, revealing a strong dependence of both on transverse and axial location in the flow field. Defining features in the spectra give insight into the frequency bands which will be more closely analyzed in future phases of this study. The results from this preliminary study point to the validity of using time-resolved schlieren imaging as a non-intrusive experimental method to generate time series, to which a range of analysis methods is applicable.
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U2 - 10.2514/6.2016-1108
DO - 10.2514/6.2016-1108
M3 - Conference contribution
AN - SCOPUS:85007431681
SN - 9781624103933
T3 - 54th AIAA Aerospace Sciences Meeting
BT - 54th AIAA Aerospace Sciences Meeting
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - 54th AIAA Aerospace Sciences Meeting, 2016
Y2 - 4 January 2016 through 8 January 2016
ER -