Abstract
Experimental investigations on the characteristics of a flow around two circular cylinders of different diameters with the ratio d2/d1 = 0.68 arranged in tandem were carried out. Reynolds number defined by the diameter of the first cylinder was varied in the range of 1.3×104 ≤ Re ≤ 5.8×104, and the longitudinal spacing between the axes of the cylinders in the interval of 0.9 ≤ L/d1 ≤ 4.0. The reattachment of a separated shear layer from the first cylinder, the jump phenomenon and the bistable flow at the critical region were confirmed in the same manner as the case of two cylinders of equal diameters. The differences between the two cases were discussed. Flow patterns were divided according to the spacing and Reynolds number. Characteristics of those flow patterns and effects of the Reynolds number were clarified.
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