Effects of Gas Content in Fluid on Oscillating Frequencies of Self-Excited Oscillation Water Jets

Abstract

The unsteady flow in and near cavity-type geometries, which belongs to a basic class of flow susceptible to self-excited oscillations, occurs in a variety of applications such as slotted-wall wind and water tunnels. Despite the diversity of types of cavity oscillations, several common features can be observed. According to the inducement cause of self-excited oscillations, Rockwell and Naudascher 12 categorized self-excited oscillations into three groups: (a) fluid-dynamic; (b) fluid-resonant; and (c) fluid-elastic. It is necessary to investigate the characteristics of self-excited oscillations in flow in order to utilize or avoid the self-excited oscillations in practical engineering situation.