周期的後流と翼面境界層との干渉現象に関する研究

概要

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The purpose of this study is to investigate the interaction between the periodic wakes and the boundary layers on a flat plate with elliptic leading edge, which is subjected to favorable and adverse pressure gradients. Detailed boundary layer measurements are performed by use of a hot-wire probe. A spoked-wheel-type wake generator is used to simulate the unsteady flow field over the suction surface of a turbine blade or a compressor blade by changing the direction of the rotation of the wake-generator. A noticeable difference in forced transition appears between the two wake-generating conditions. It follows that effect of velocity deficit and relative motion of the fluid inside the wake, so-called negative jet, plays an important role in the transition process. It is found that the wake passage tend to delay boundary layers transition at decelerating flow region.
社団法人日本ガスタービン学会の論文
1998-06-10