Thwaites, S.; Fletcher, Neville H.
The growth in amplitude of a sinuous disturbance propagating along a fully turbulent diverging
planar air jet is studied experimentally for a range of slit widths, blowing pressures and acoustic
excitation frequencies relevant to organ pipes. The wave amplitude is found to increase approximately
exponentially ·with distance provided this amplitude remains .small compared with the local
jet width. For larger amplitudes the growth becomes linear. In the exponential growth regime the
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