115 三次元境界層における乱流遷移の可視化

第一報 回転軸対称体まわりの流れ

抄録

Turbulent transition problem of three-dimensional (3-D) boundary layers become one of the major research topics in fluid dynamics field, because of further refinement of general fluid machineries. Especially, investigation of the boundary-layer transition over a swept wing is important in order to increase commercial aircraft fuel efficiency. However, turbulent transition process in 3-D boundary layers are not well understood.
Purpose of the present investigation is therefore, to clarify the transition process through visualization in the case of rotating axisymmetric bodies in general. Results shows that streamwise vortices appear in advance to T-S wave instability, and appearing instability is influenced by the local flow condition where transition appears, and centrifugal or crossflow instability might appear.