Frequency and phase characteristics of the edge tone: Part II

Abstract

This paper is the second half of a two-part publication. The first part contains a detailed overview of the edge tone literature and also describes the qualitative behaviour of the edge tone when varying its main parameters i.e. the mean exit velocity of the jet and the nozzle-to-wedge distance in the case of both top hat and parabolic jet velocity profiles. This second part contains the quantitative result of a detailed parametric study to explore the (Re, h/δ) dependence for top hat and parabolic exit velocity profiles. We arrive at a very similar formula as that of Brown (1937) on a much broader experimental and computational basis. Moreover, it is also shown that the phase of the jet disturbance between the nozzle and the wedge does not vary linearly with the distance from the nozzle, thus the convection velocity of the jet disturbance is not constant, as usually assumed in the theoretical models.