This study investigates the near-field acoustic and hydrodynamic characteristics of an axisymmetric Mach 1.5 air jet exhausting over a nominal one-twentieth-scale jet-blast-deflector/carrier-deck model at impingement distances ranging from 6 to 12 nozzle diameters, and at jet stagnation temperatures up to 1200 K. Particular focus is on documenting the acoustic field along a simulated foul line on the flight deck, where many crew members are located during flight operations. The jet exhausting over the semi-infinite deck surface, in the “grazing-jet” configuration, serves as a baseline for which to assess the changes to the acoustic field resulting from the impingement. When the jet impinges on the deflector, the noise at upstream locations is dominated by impingement noise that is broadband in nature, and results in an increase in the overall sound-pressure level of 5–12 dB above the baseline levels for the 1200 K jet. As the impingement distance is decreased, a higher-energy portion of the jet shear layer interacts with the surface; thus, the acoustic-source strength is inherently higher and the upstream overall sound-pressure levels monotonically increase. Increasing the jet temperature appears to result in more-distributed acoustic sources and to broaden the directionality of the acoustic field.
Supersonic Jet Impingement on a Model-Scale Jet Blast Deflector
AIAA Journal ; 55 , 8 ; 2522-2536
2017-05-15
15 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Supersonic Jet Impingement on a Model-Scale Jet Blast Deflector
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|Supersonic Jet Impingement on a Model-Scale Jet Blast Deflector
Online Contents | 2017
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