TY - GEN
T1 - Comparison of spatial and temporal resolution on high speed axisymmetric jets
AU - Berry, Matthew G.
AU - Magstadt, Andrew S.
AU - Berger, Zachary P.
AU - Shea, Patrick R.
AU - Glauser, Mark N.
AU - Ruscher, Christopher J.
AU - Gogineni, Sivaram P.
N1 - Funding Information:
The authors would like to acknowledge Spectral Energies, LLC. Phase II SBIR, with AFRL/RQTE (Dr. Barry Kiel, PM) for the ongoing support and interactions throughout these research endeavors. The authors also acknowledge Dr. Jacques Lewalle and Pingqing Kan (Syracuse University) for many insightful discussions throughout the experiments and analysis.
Publisher Copyright:
© 2016, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2015
Y1 - 2015
N2 - The current investigation examines a 2 inch, circular, high-speed jet with two separate PIV setups simultaneously sampled with far-field pressure. Subsonic and supersonic velocity measurements are performed in the streamwise (r-z) plane of the jet with both time-resolved PIV and large window PIV configurations, taken at different times. The 10 kHz time-resolved PIV captures 1.5 streamwise diameter windows at several downstream locations. The large window PIV utilizes 3 simultaneously captured cameras stitched together to view a single interrogation window of the flow field approximately 2.5-9 stream-wise diameters from the nozzle lip. Both PIV setups have an approximately 1.5 diameter spatial window in the radial direction. In this paper, we will focus on the Mach 0.6 flow in the region of the potential core collapse (z/D = 6-7.5). Low-dimensional modeling techniques in the form of proper orthogonal decomposition, Lumley (1967)2 and Sirovich (1987),3 are implemented in order to help us understand the large scale, energetic events within the flow. In previous work, the time-dependent POD modes from the TRPIV have been correlated with the far-field acoustics to determine which low-dimensional structures best relate to the noise. These correlated events are deemed as "loud" modes, Low et al. (2013).4 One issue is that this approach is greatly in fluenced by the temporal and spatial nature of the PIV. By utilizing the differences in our PIV setups, we map the convergence of POD modes based on their spatial and temporal resolution.
AB - The current investigation examines a 2 inch, circular, high-speed jet with two separate PIV setups simultaneously sampled with far-field pressure. Subsonic and supersonic velocity measurements are performed in the streamwise (r-z) plane of the jet with both time-resolved PIV and large window PIV configurations, taken at different times. The 10 kHz time-resolved PIV captures 1.5 streamwise diameter windows at several downstream locations. The large window PIV utilizes 3 simultaneously captured cameras stitched together to view a single interrogation window of the flow field approximately 2.5-9 stream-wise diameters from the nozzle lip. Both PIV setups have an approximately 1.5 diameter spatial window in the radial direction. In this paper, we will focus on the Mach 0.6 flow in the region of the potential core collapse (z/D = 6-7.5). Low-dimensional modeling techniques in the form of proper orthogonal decomposition, Lumley (1967)2 and Sirovich (1987),3 are implemented in order to help us understand the large scale, energetic events within the flow. In previous work, the time-dependent POD modes from the TRPIV have been correlated with the far-field acoustics to determine which low-dimensional structures best relate to the noise. These correlated events are deemed as "loud" modes, Low et al. (2013).4 One issue is that this approach is greatly in fluenced by the temporal and spatial nature of the PIV. By utilizing the differences in our PIV setups, we map the convergence of POD modes based on their spatial and temporal resolution.
UR - https://www.scopus.com/pages/publications/84982883824
UR - https://www.scopus.com/pages/publications/84982883824#tab=citedBy
U2 - 10.2514/6.2015-0738
DO - 10.2514/6.2015-0738
M3 - Conference contribution
AN - SCOPUS:84982883824
SN - 9781624103438
T3 - 53rd AIAA Aerospace Sciences Meeting
BT - 53rd AIAA Aerospace Sciences Meeting
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - 53rd AIAA Aerospace Sciences Meeting, 2015
Y2 - 5 January 2015 through 9 January 2015
ER -