Interference between Boundary Layer Flow and Wake Flow

The characteristics of a flow, in which the laminar boundary layer along a flat plate at zero incidence interferes in the turbulent wake behind a circular cylinder, were studied experimentally and theoretically. The main results are as follows. (1) The boundary layer flow undergoes a remarkable transition from the laminar to the turbulent region under the influence of the velocity fluctuation of the wake flow. (2) The theoretical results based on the composite velocity profile obtained by superimposed the boundary layer flow on the wake flow agree fairly well with the measured ones.