The Round Jet in a Cross-Flow (Review)

Results of experimental and numerical studies on characteristics of the developing round jet with parabolic velocity profile in a crossflow are presented. The basic differences of characteristics (parameters, properties) of development of the round jet with parabolic velocity profile and «shock» velocity profile are showed. As it is outlined, the round jet with parabolic velocity profile in a crossflow is transformed to two stationary counter rotating vortices. In the current work it is shown, that the most unsteady high-frequency eigenmodes correspond wave packets onto the couple of counter rotating vortices. Decrease of frequency leads to development of the eigenmodes closer to wall in track of the jet. The growths of penetration of jet into a crossflow and air inflow by near-field of jet from crossflow are observed. In addition, it was shown, that boundary of the jet and crossflow can stretch and become thin under the influence of crossflow.