Study of a Bounded Jet Flow Considering the Initial Turbulence : Experiments with a Nozzle Having Aspect Ratio of 3

概要

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According to the experimental results about the jet flow issuing from the nozzles contracted on two sides and on four sides into the region bounded by two parallel flat plates, behavior of the flow depends on the nozzle shape and the initial turbulence intensity considerably. The variance and the degree of deformation of the velocity profile between the flat plates and the displacement thickness of boundary layer developed on them are newly introduced in this paper. By using these measures, it has been found that the extent of the secondary flow induced by the flat plates can be estimated quantitatively. Furthermore, the velocity profile of a bounded jet in the streamwise direction is similar to that of a two-dimensional jet approximately regardless of the distance from the bounding plate, except for a flow with small initial turbulence intensity with the nozzle contracted on all sides.
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