A Study of Boundary Layers in the Downstreams of a Cylinder Row in Motion : 1st Report, Experimental Investigation on the Boundary Layer of a Flat Plate

Boundary layers of a flat plate located parallel to the mean flow in the downstreams of a cylinder row in motion were empirically examined, in order to obtain fundamental know1edges concerning the mutual interference among blade rows working in viscous incompressible fluid. Forced by the fluctuation in the main stream velocity, a unique turbulent boundary layer-forced turbulent boundary layer-is developed at a distance from the leading edge of the flat plate. This boundary layer has several properties different from those of ordinary turbulent boundary layer. The characteristics, such as mean and fluctuation velocity distributions, of the forced turbulent boundary layer as well as of the boundary layer under transition to this type were investigated. With increased fluctuation velocity in the main flow around the leading edge, the thickness of the boundary layer near the leading edge increases. Factors influencing this phenomenon were discussed.