On the mechanism of screech tone generation in underexpanded rectangular jets

Large Eddy Simulation of Screech Tone Generation in a Planar Underexpanded Jet

12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference) ◽

10.2514/6.2006-2496 ◽

2006 ◽

Cited By ~ 13

Author(s):

Julien Berland ◽

Christophe Bogey ◽

Christophe Bailly

Keyword(s):

Large Eddy Simulation ◽

Screech Tone ◽

Underexpanded Jet ◽

Eddy Simulation ◽

Large Eddy ◽

Tone Generation

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Helical Screech Tone Generation in an Overexpanded Jet

23rd AIAA/CEAS Aeroacoustics Conference ◽

10.2514/6.2017-3208 ◽

2017 ◽

Cited By ~ 2

Author(s):

Junhui Liu ◽

Andrew T. Corrigan ◽

Kailas Kailasanath ◽

Ravi Ramamurti ◽

Ephraim J. Gutmark

Keyword(s):

Screech Tone ◽

Tone Generation

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Optical two-tone generation and SSB modulation using electro-optic modulator with suppressing redundant spectrum components

International Journal of Microwave and Wireless Technologies ◽

10.1017/s175907871100047x ◽

2011 ◽

Vol 3 (3) ◽

pp. 295-300 ◽

Cited By ~ 2

Author(s):

Akira Enokihara ◽

Tadashi Kawai ◽

Tetsuya Kawanishi

Keyword(s):

Input Power ◽

Intensity Level ◽

Optical Signals ◽

Single Sideband ◽

Electro Optic ◽

Rf Signals ◽

Frequency Components ◽

Optical Single Sideband ◽

Tone Generation ◽

Electro Optic Modulator

Doubled frequency optical two-tone generation and optical single sideband (SSB) modulation by the dual-electrode-type electro-optic (EO) modulator with a single Mach–Zehnder (MZ) interferometer were considered. We theoretically showed that redundant spectrum components in the modulated optical signals, which are caused by the imbalance of light splitting ratio between the two arms of the interferometer, are significantly suppressed by controlling the input power ratio of RF modulation signals applied to each electrode. This effect was confirmed by the experiment, where an optical two-tone with the redundant components 49.8 dB lower than the primary two-tone components in intensity level was obtained. This method is also valid for suppression of undesired frequency components of RF signals that are generated at a photo detector from the optical two-tone waves propagated through a dispersive optical fiber.

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