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Experimental investigations on the characteristics of the flow around two circular cylinders in a cross flow were carried out. Reynolds number was varied in the range of subcritical values, 8. 7×103 <__= Re <__= 5. 2×104 and the distance between the axes of the cylinders in the spacings 1. 03 <__= Ld <__= 5. 0, where d is the diameter of the cylinder. Up to the spacings of L/d=3. 5, where the quasi-stationary vortices are formed between the cylinders, the changes of the flow structure around the two cylinders were observed at the spacings of L/d=1. 1, 1. 6, 2. 3 and 3. 1. Particularly, the dependency of the Reynolds number was recognized in the range of 1. 1 <__= L/d <__= 2. 0.
Tamotsu IGARASHI (Thu,) studied this question.