Etude expérimentale des sons auto-entretenus produits par un jet issu d'un conduit et heurtant une plaque fendue

The production of self-sustained tones (up to 125 dB) by a low Mach number free plane jet impinging on a slotted plate, known as slot-tone, is experimentally studied. For all geometries of the slot’s edge tested, the tones are generated from 6 m/s and when a resonant mode of the duct from which the jet flows out is excited. The Strouhal number associated with the tones fundamental frequency describes stages. These one are linked to the number of vortices present, with vortex pairing possibilities. On the other hand, the frequency domain of the fundamental is defined by the two instability modes of the jet. If the edge of the slot is beveled and if this one is placed backwards to the flow, the tones occurs at a lower speed (3.5 m/s) as soon as the jet becomes turbulent, and the excitation of an acoustic resonator is then not necessary.

Grantor dc:publisher

Université de La Rochelle

Year dc:date

2003

Author dc:creator

• Billon, Alexis

Contributors dc:contributor

• Sakout, Anas
• Valeau, Vincent

• Aeroacoustics
• Self-sustained tones
• slot-tone
• Engineering, computing & technology
• Mechanical engineering
• Ingénierie, informatique & technologie
• Ingénierie mécanique

Statement dc:rights

• open access
• info:eu-repo/semantics/openAccess

Licence

• http://purl.org/coar/access_right/c_abf2

Language dc:language

fr

Identifier

info:hdl:2268/33766

OAI identifier oai:identifier

oai:orbi.ulg.ac.be:2268/33766