Experimental Study of Turbulent Spots.
Annual rept. 1 May 80-30 Apr 81,
FLOW RESEARCH CO KENT WA
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A novel visualization technique that utilizes fluorescent dye excited by a sheet of laser light is employed to study turbulent spots evolving in an unstable laminar boundary layer. The large growth rates of the spot in the spanwise direction cannot be explained by classical entrainment. It is suggested that a new mechanism, termed destabilization, accounts for the larger growth rates. Growth by destabilization appears to be the result of the turbulence inducing perturbation into the nearby unstable boundary layer. This disturbance grows and breaks down, thus forming the new turbulence in the spot. Author
- Fluid Mechanics