In this paper, the region sensitive of both the frequency of sound and the average velocity at the nozzle exit, is experimentally determined. With respect to this region, the relation between the behaviour of the two-dimensional water jets affected by sound and the decay of turbulence is discussed by using Tayler's statistical theory of turbulence.
The following is confirmed:
1) A responsive frequency bandwidth involving the most sensitive frequency, shifts towards a higher frequency with an increase in the average velocity at the nozzle exit.
2) A water jet sensitive to sound is affected significantly by the variation in both the rectangular shape of the nozzle's section and the sound pressure.
3) The behaviour of a sound-sensitive water jet is related to the decay of turbulence in the downstream side of the transition domain where a laminar jet becomes a turbulent jet.