Origination of wave packets at localized streaks

Abstract eng:
Turbulence production processes in gradient boundary layer have been studied experimentally. The longitudinal localized disturbances arising in the boundary layer under the action of free—stream turbulence were artificially modeled using a blowing—suction technique. Wave packets, or forerunners, produced in the boundary layer, in the region preceding the abrupt local change of flow velocity near the longitudinal disturbance fronts, were examined. The results of the study make reason to consider the forerunners as wave packets of 3D instability (T—S) waves. It was observed that the forerunners are strongly amplified in the adverse pressure gradient flow. It was found that at downstream development of the forerunners they transform into so — called Lambda—structures.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket