TY - GEN
T1 - Directionality and pulsing of acoustic propagation to the far-field of a supersonic jet flow
AU - Starke, Genevieve M.
AU - Lewalle, Jacques
AU - Glauser, Mark
AU - Gogineni, Sivaram
N1 - Funding Information:
This work has been supported in part by AFOSR Grant No. FA9550-15-1-0435 , by Phase I Prime Contract No. FA8650-15-M-2596, and Prime Contract No. FA8650-16-C-2726- SBIR II- from AFRL and Spectral Energies LLC, by the REU program in MAE at SU, and by Syracuse University. The work would not be possible without the skillful data acquisition (and pushing the limits) by the Skytop lab guys (Andy Magstadt, Matt Berry) under the leadership of Mark Glauser. This work also benefited from mentorship and interactions with Pinqing Kan and Andrew Tenney.
Publisher Copyright:
© 2017 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
PY - 2017
Y1 - 2017
N2 - We analyze simultaneous data in the near- and far-field of a 2-stream supersonic jet. The flow combines a rectangular jet at Ma = 1.6 and a rectangular wall jet at Ma = 1.0 separating the primary jet from a deck plate. We treat simultaneous data from deck- mounted kulite sensors and far-field microphones sampled for 10 s at 100 kHz. Aside from a clear 33kHz tone, traced previously to Kelvin-Helmholtz instability at the trailing edge of the splitter plate between the jets, a number of weaker pulses are identified at lower frequencies of the order of 1 to 5 kHz. The pulse frequencies are active in correlations between the sensors. In particular, the cross-correlation between near- and far-field shows bands of activity that differ for the various pairs of sensors (6 kulites and 12 microphones); the lags between near- and far-field are also frequency and direction-dependent. Significant departures from the expected propagation time (about 11 ms) are discussed. In addition to directional dependencies of most statistics, the modulation of the 33 kHz tone by near-field pulsing is documented.
AB - We analyze simultaneous data in the near- and far-field of a 2-stream supersonic jet. The flow combines a rectangular jet at Ma = 1.6 and a rectangular wall jet at Ma = 1.0 separating the primary jet from a deck plate. We treat simultaneous data from deck- mounted kulite sensors and far-field microphones sampled for 10 s at 100 kHz. Aside from a clear 33kHz tone, traced previously to Kelvin-Helmholtz instability at the trailing edge of the splitter plate between the jets, a number of weaker pulses are identified at lower frequencies of the order of 1 to 5 kHz. The pulse frequencies are active in correlations between the sensors. In particular, the cross-correlation between near- and far-field shows bands of activity that differ for the various pairs of sensors (6 kulites and 12 microphones); the lags between near- and far-field are also frequency and direction-dependent. Significant departures from the expected propagation time (about 11 ms) are discussed. In addition to directional dependencies of most statistics, the modulation of the 33 kHz tone by near-field pulsing is documented.
UR - http://www.scopus.com/inward/record.url?scp=85017192761&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85017192761&partnerID=8YFLogxK
U2 - 10.2514/6.2017-0227
DO - 10.2514/6.2017-0227
M3 - Conference contribution
AN - SCOPUS:85017192761
T3 - AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting
BT - AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 55th AIAA Aerospace Sciences Meeting
Y2 - 9 January 2017 through 13 January 2017
ER -