퓐이 나선형으로 부착된 원주희 후류에 관한 실험적 연구

Experimental Study on the Wake behind a Circular Cylinder with Helical Fin

The characteristics of two dimensional turbulent wake flow past a circular cylinder with helical fin was investigated by using X type hot wire anemometer for the experiment. As a result it is cleared that Karman vortex sheds from the cylinder with helical fin as the same as a circular cylinder or a rectangular cylinder. Turbulent characteristics such as the distribution of the mean velocity, turbulent kinetic energy, autocorrelation coefficient and its spectrum of them are suggested. It is also found that the width of the wake flow become larger as the pitch of the fin increased, and the frequency of vortex shedding is on the decrease.