Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 07, 2019 - November 08, 2019
The Magnus effect is a phenomenon in which lift occurs in a rotating sphere or cylinder, and it is partially applied in engineering. In addition, a negative Magnus effect has been confirmed in which the lift that should originally be in a uniform direction is generated in the opposite direction. The Magnus effect is caused by the asymmetric separation of the boundary layer due to the difference in relative velocity between the upper and lower surfaces of the cylinder due to rotation. The negative Magnus effect is a phenomenon that occurs when the boundary layer on one side causes a turbulent transition due to the difference in relative velocity between the upper and lower surfaces. Therefore, it is important to measure the boundary layer on the surface of a rotating cylinder to elucidate these phenomena. In this study, developed a hot-wire anemometer probe that can measure the boundary layer, and conducted an experiment to measure the velocity boundary layer around a cylinder. As a result, we were able to measure the velocity distribution and turbulence intensity distribution of a very thin boundary layer generated in a stationary cylinder. And it was confirmed that small scale disturbances occurred locally in the peeled shear layer.
