Measurements on tones generated in a corrugated flow pipe with special attention to the influence of a low frequency oscillation.

Ulf R. Kristiansen (1) , Pierre-Olivier Mattei (2) , Cédric Pinhède (2) , Muriel Amielh (3)

1 NTNU Acoustics Research Center
2 LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]
3 IRPHE - Institut de Recherche sur les Phénomènes Hors Equilibre

It is well known that an air flow in a corrugated pipe might excite the longitudinal acoustic modes of the pipe. In this letter is reported experiments where a low frequency, oscillating flow with velocity magnitudes of the same order as the air flow has been added. Depending on the oscillation strength, it might silence the pipe or move the resonances to higher harmonics. It is also shown that a low frequency oscillation by itself might excite a higher frequency acoustic resonance of the pipe.

Mots clés: Singing Risers; acoustic control; flow excitation

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

Ulf R. Kristiansen, Pierre-Olivier Mattei, Cédric Pinhède, Muriel Amielh. Measurements on tones generated in a corrugated flow pipe with special attention to the influence of a low frequency oscillation.. 2010. ⟨hal-00540390v2⟩