Abstract
The present aim is to reveal the flow past a rotating pipe which is immersed parallel to the mainstream. At first, we conduct field observations of a flying pipe in rotation using a pair of high-speed video cameras, together with motion analyses based on their recorded images, which quantitatively show paths and the change of kinetic parameter such as rotation parameter Ω^* of the flying pipe. Here, Ω^* represents the ratio of pipe's rotating velocity at the outer diameter to flow velocity of the mainstream. As a result, Ω^* monotonically increases with increasing travel distance X. In addition, we conduct numerical simulations by a finite difference method based on the MAC scheme, whose results suggest that the pipe-rotation effect becomes remarkable for a rotation parameter Ω^* > 0.4. This suggests that the flight at Ω^* ≈ 0.4 is suitable. Besides, at Ω^* ≥ 1.8, the axisymmetry of wake becomes broken.
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