On the Discrete Tone Generated in High Subsonic Jet (Part 1)

Abstract

This paper describes on the frequency characteristics of discrete tone which is emitted when a thin circular cylinder is placed in a high subsonic jet in the vicinity of a circular nozzle exit. This discrete tone has similar characteristics to ordinary edge-tone which is emitted in a low speed jet stream. But, the frequency of this discrete tone decreases as the wind velocity increases, and this tendency is opposite to that of ordinary edge-tone characteristics.
The frequency of this discrete tone is calculated by using a model of aerial vibrations in an open pipe, and is compared with the experimental values.