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On the Comparison of the Long Penetration Mode (LPM) Supersonic Counterflowing Jet to the Supersonic Screech JetClassic tonal screech noise created by under-expanded supersonic jets; Long Penetration Mode (LPM) supersonic phenomenon -Under-expanded counter-flowing jet in supersonic free stream -Demonstrated in several wind tunnel tests -Modeled in several computational fluid dynamics (CFD) simulations; Discussion of LPM acoustics feedback and fluid interactions -Analogous to the aero-acoustics interactions seen in screech jets; Lessons Learned: Applying certain methodologies to LPM -Developed and successfully demonstrated in the study of screech jets -Discussion of mechanically induced excitation in fluid oscillators in general; Conclusions -Large body of work done on jet screech, other aero-acoustic phenomenacan have direct application to the study and applications of LPM cold flow jets
Document ID
20150020927
Document Type
Other - Other
Authors
Farr, Rebecca A. (NASA Marshall Space Flight Center Huntsville, AL, United States)
Chang, Chau-Lyan (NASA Langley Research Center Hampton, VA, United States)
Jones, Jess H. (AI Signal Research, Inc. Huntsville, AL, United States)
Dougherty, N. Sam (Jacobs Engineering and Science Services and Skills Augmentation Group (ESSSA) Huntsville, AL, United States)
Date Acquired
November 6, 2015
Publication Date
June 25, 2015
Subject Category
Acoustics
Report/Patent Number
M15-4693
Meeting Information
AIAA/CEAS Aeroacoustics Conference(Dallas, TX)
Distribution Limits
Public
Copyright
Public Use Permitted.

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