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 oscillation itself may excite higher frequency whistling sounds in the pipe.

1.
U. R.
Kristiansen
and
G. A.
Wiik
,
“Experiments on sound generation in corrugated pipes with flow,”
J. Acoust. Soc. Am.
121
,
1337
1444
(
2007
).
2.
V.
Debut
,
J.
Antunes
, and
M.
Moreira
,
“Flow-acoustic interaction in corrugated pipes: Time domain simulation of experimental phenomena,”
in
Ninth International Conference on Flow-Induced Vibration
,
Prague
,
Czech Republic
,
2008
, pp.
417
425
.
3.
H.
Goyder
,
“On the modelling of noise generation in corrugated pipes,”
J. Pressure Vessel Technol.
132
(
4
),
041304
(
2010
).
4.
D.
Tonon
,
B. J. T.
Landry
,
S. P. C.
Belfroid
,
J. F. H.
Willems
,
G. J. C.
Hofmans
, and
A.
Hirschberg
,
“Whistling of a pipe system with multiple side branches: Comparison with corrugated pipes,”
J. Sound Vib.
329
,
1007
1024
(
2010
).
5.
G.
Nakiboglu
,
S. P. C.
Belfroid
,
J.
Golliard
, and
A.
Hirschberg
,
“On the whistling of corrugated pipes: Effect of pipe length and flow profile,”
J. Fluid Mech.
672
,
78
108
(
2011
).
6.
S.P. C
Belfroid
,
R. J
.
Swindell
, and
N.
Kitney
,
“Flow induced pulsations due to flexible risers,”
in Offshore Technology Conference, Houston Texas,
4–7 May 2009
, Report No. OTC 19904.
7.
L. E.
Kinsler
,
A. R.
Frey
,
A. B.
Coppens
, and
J. V.
Sanders
,
Fundamentals of Acoustics
(
Wiley
,
New York
,
2000
), pp.
272
301
.
8.
U.
Kristiansen
,
P-O.
Mattei
,
C.
Pinhede
, and
M.
Amielh
, “
Measurements on tones generated in a corrugated flow pipe with special attention to the influence of a low frequency oscillation
,” in
Proceedings of the 34th Scandinavian Symposium on Physical Acoustics
,
Geilo
,
Norway
, 30 January–2 February 2011.
9.
N.
Delprat
,
“Low-frequency components and modulation processes in compressible cavity flows,”
J. Sound Vib.
329
,
4797
4808
(
2010
).
10.
D.
Tonon
,
G.
Nakiboglu
,
J.
Golliard
, and
A.
Hirschberg
, “
Voice of the dragon: The mystery of the missing fundamental mode
,” in
Proceedings of 20th International Symposium on Music Acoustics
,
Sydney and Katoomba, Australia
,
25–31 August, 2010
, Report No. 29.
11.
Encyclopedia of Physics
, edited by
S.
Flügge
(
Springer
,
Berlin
,
1960
),
Vol. IX
, Fluid Dynamics III, pp.
340
343
.
12.
G.
Birkhoff
and
E. H.
Zarantonello
,
Jets, Wakes, and Cavities
(
Academic
,
New York
,
1957
), pp.
221
235
.
You do not currently have access to this content.