| dc.description.abstract |
The flow field around a rotating cylinder was measured experimentally at different Reynold’s
number, and the velocity distribution and turbulence distribution at different sections behind
the rotating cylinder were analyzed. The theoretical model is used to analyze the flow field
variation and came to the following conclusions: When the cylinder rotates
counterclockwise, with the increase of the relative speed at the same Reynolds number, the
position of the velocity mutation below the wake region of the rotating cylinder moves up
with the increase of the relative speed, while the position of the velocity mutation above
remains unchanged. With the increase of Reynolds number, the position of velocity mutation
below the wake region of the rotating cylinder moves down to a small extent. Through
numerical simulation, it is found that the position of the lower vortex behind the cylinder
moves up obviously after the cylinder rotates, and the amplitude is large. The lower free
shear layer has obvious upward movement, while the upper free shear layer has little change
in position. Finally, through theoretical analysis, it is found that the upward movement of the
lower vortex on the rear side of the rotating cylinder has a significant effect on the lift force
of the rotating cylinder. Under the condition of high Reynolds number, the change of the
lower vortex position on the rear side of the rotating cylinder has an important effect on the
lift force of the rotating cylinder and the change of the free shear layer in the wake region. |
en_US |
