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.

Topics
Microphones, Acoustic phenomena, Acoustic field, Animal sounds, Vacuum cleaner, Atomic oscillator strengths, Frequency spectrum, Fluid mechanics, Fluid dynamics, Oscillating flow
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© 2011 Acoustical Society of America.
2011
Acoustical Society of America
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