層流斑点の下流発達 : V方向速度成分の測定(G05-5 内部流れ・境界層(1),G05 流体工学部門一般講演)

概要

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It was known that disturbance, introduced artificially into a supercritical laminar boundary layer along a flat plate by a small jet, is still laminar during the initial stage of its downstream evolution. Thus, we named it a laminar spot because it resembled a turbulent spot. From measurements using a 16ch I-type probe, we found that a spot develops downstream increasing the number of the low-speed protuberances on the centerline. We investigated newly the downstream development of a laminar spot using a new hot-wire anemometer with two parallel wires, which is instantaneously capable of measuring U and V. From this investigation, we found that the region accompanied with the negative z-vorticity component, which is adjacent to high shear-layer at the back of the first low-speed protuberance, is strengthened and stretched upward, moreover, this region was separated up and down by the mean velocity gradient and its upper part grew into the second low-speed protuberance.
一般社団法人日本機械学会の論文
2004-09-04