Self-Oscillation Regimes of Penetration of Free or Plunging Jets through Liquid Surface

Abstract

A brief review is given for the most significant results obtained in studies carried out in the Institute of Mechanics, Moscow State University, and focused on a new class of transient flows of an incompressible liquid that form when vertical plunging or free flat or axially symmetrical water jets penetrate through the surface of water placed in relatively narrow channels or when free thin-wall water jet, flowing from a conical slotted nozzle with a vertical axis penetrates through water surface in a rectangular vessel. Wide ranges of the values of key parameters were found to exist at which self-oscillation flow regimes unknown before form in the liquid. Different formation mechanisms of such regimes and the characteristic features of the experimentally and numerically determined dependencies of self-oscillation periods on the key parameters are discribed. Possible applications of the obtained results are given.