抄録
The characteristics of a steady flow along a coaxial cylinder with the front step was investigated by means of the pressure measurement on the cylinder surface and the visualization technique of the smoke method at the subcritical Reynolds number. Measurements were carried out with the front step all length vary in size between -10 mm and 20 mm. The negative pressure distribution acts to turn in the step wall for the separation flow from the front edge of an axial cylinder. The pressure distribution of the cylinder surface was compared with respect to the step size ratio. A minimum wake section area of the model with annular step is one half with the no step, then the pressure on the step part is twice negative values of the total pressure at the optimum step.
