Abstract
In order to understand the aspect of the mutual interference flow from two circular cylinders,the visual observation experiment was performed.In the experiment,the distance ratio and the arrangement angle were made into the parameter,and investigation of vortex shedding frequency or the flow pattern was performed.The distance ratio is three kinds,1.5d(d is a circular cylmder diameter),2.5d,and 5.5d,and an arrangement angle is seven kinds per 15 degrees from 0 degree to 90 degrees.The Reynolds number was about 640.As the result of experiment,even if the distance ratio was the same,the vortex sheddmg characteristic changed with arrangement angles.Mutual interference will become remarkable if a distance ratio is small.In the arrangement angle,30 degrees and 45 degrees are carrying out mutual interference most.Even when a forced in-line oscillation was performed under the conditions in which two circular cylinders are carrying out mutual mterference,it was found that a lock-in phenomenon occurs.
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