Experimental study of the influence of low frequency flow modulation on the whistling behavior of a corrugated pipe

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 airflow in a corrugated pipe can excite whistling at the frequencies of the pipe's longitudinal acoustic modes. This short contribution reports on the results of experiments where a low frequency, oscillating flow with velocity magnitudes of the same order as the airflow has been added. Depending on the oscillation strength, it has been found that this flow may silence the pipe or move the whistling to higher harmonics. It is also shown that the low frequency oscillationitself may excite higher frequency whistling sounds in the pipe.

Mots clés: Generation of sound by fluid flow; corrugated pipes; resonance; low frequency modulation

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

Ulf R. Kristiansen, Pierre-Olivier Mattei, Cédric Pinhède, Muriel Amielh. Experimental study of the influence of low frequency flow modulation on the whistling behavior of a corrugated pipe. Journal of the Acoustical Society of America, 2011, 130 (4), pp.1851-1855. ⟨10.1121/1.3628665]⟩. ⟨hal-00628704⟩