flue organ pipe
fundamental oscillation mode
Dimensionless representation of the pressure signal measured inside a flue organ pipe shows that
the dimensionless amplitude is a function of the Strouhal number only. This behavior indicates
that amplitude saturation is due to a non-linear interaction of the acoustic flow with the jet flow.
Correlation of these results with flow visualizations stresses the importance of vortex shedding at
the edge of the labium.
The aim of the present paper is to demonstrate the power of dimensionless representation of
experimental data as a tool to track down basic physical mechanisms in the sound production of
wind instruments. Using the example of the amplitude of the fundamental oscillation mode we
will, by correlation with flow visualizations, obtain a caricature which may explain some features
of the sound production in flue instruments.
Contribution au colloque ou congrès : ISMA: International Symposium of Music Acoustics