S0502-7-2 層流境界層中に設置された正四角錘体周りの流れ([S0502-7]噴流,後流および剥離流れ現象の解明と制御(7))
詳細
Flow visualization by a dye injection method has been made for upstream region of a pyramid obstacle placed in a laminar boundary layer. The Reynolds numbers based on a height of the obstacle and the relative boundary layer thickness were 610 and 0.71 respectively. As the apex angle 2α increases, the vortex center position of a primary necklace vortex moves upstream and upward, and have a peak value. Furthermore, as 2α→180°, the position tends to converge to the upstream edge of the obstacle. The position for attack angle γ=0 is far away from the upstream edge of the obstacle compared with that of γ=45°.Also, the curvature radius of a streak line for the upper part of the obstacle increases with 2α.
