大規模乱流場における風洞壁面境界層の制御(乱流現象の制御(1),一般講演)

概要

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It is difficult for the environmental experiments in a high R_λ windtunnel to attain ideal uniformity and good two-dimensionality of turbulence quantity distribution because of the streamwise growth of thick turbulent boundary layers on its walls. A newly designed boundary layer controller (BLC) is installed on the walls to remove undesired effects of the boundary layer development. When the BLC is driven, homogenous and shear flow fields are generated and the distributions of their turbulence quantities are markedly improved in the test section. Then, we realized uniform large-scale turbulence fields with R_λ>300 and Reynolds stress is almost constant nearer to the wall comparing with the case without BLC. When the turbulent shear flow field is generated, not only mean velocity gradient but also the uniformity and the two-dimensionality of turbulence quantities are apparently improved, though, the lateral integral scale is not recovered near the wall.
日本流体力学会の論文
2007-08-06