Shock Oscillations in a Supersonic Jet Exhibiting Antisymmetrical Screech

It was shown that the shocks oscillate at the screech frequency, in a symmetrical or antisymmetrical manner, according to the screech mode. The temporal signals of two diametrically opposed near-field microphones were also considered. At a nozzle pressure ratio of 2.54, corresponding to a flapping m...

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Veröffentlicht in:	AIAA journal 2012-09, Vol.50 (9), p.2017-2020
Hauptverfasser:	André, Benoît, Castelain, Thomas, Bailly, Christophe
Format:	Artikel
Sprache:	eng
Schlagworte:	Acoustics Aeroacoustics, atmospheric sound Aerodynamics Aircraft Algorithms Amplitudes Asymmetry Exact sciences and technology Fluid dynamics Frequencies Fundamental areas of phenomenology (including applications) Mathematical analysis Microphones Modulation Noise (turbulence generated) Oscillations Physics Pressure Pressure ratio Tracking Turbulent flows, convection, and heat transfer
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Zusammenfassung:	It was shown that the shocks oscillate at the screech frequency, in a symmetrical or antisymmetrical manner, according to the screech mode. The temporal signals of two diametrically opposed near-field microphones were also considered. At a nozzle pressure ratio of 2.54, corresponding to a flapping mode B, both microphones showed a simultaneous modulation of the screech amplitude at a frequency of the order of 1=1000 of the screech frequency.
ISSN:	0001-1452 1533-385X
DOI:	10.2514/1.J051802