Experimental Study of the Development of a Helium Jet during Acoustic Action

A helium jet subjected to acoustic action is experimentally studied by the particle image velocimetry method. The mechanisms of flow stability loss are discussed. An asymmetric instability mode is shown to develop in the jet subjected to the action of sound, which leads to jet division. Jet vibrations are found to be accompanied by a secondary instability, which manifests itself in the formation of vortices inside the jet.