Abstract
The measurements of velocity vectors are made in the wake(X/d=8) of a circular cylinder with arc grooves. The experiments are conducted by changing the groove number, groove depth, Reynolds number(Re) and the angle of the first formed groove. We know that the optimum groove angle is 70 degree and the wake velocity profiles are improved at a few conditions. According to vortex shedding frequency distributions, the key solutions to vary the flow field behind the circular cylinder are 70 degree groove angle and more deeper grooves than 0.2㎜ depth.
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