一様流中の回転円すい体上境界層の乱れ特性

概要

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The characteristics of turbulence in the boundary layer developed on a rotating cone in an axial uniform stream are investigated experimentally. Measurements of all the six components of the Reynolds stress and the triple products of the turbulent velocity fluctuations are made at various values of the surface-to-free stream velocity ratio λ_b for two different vertex angles, θ=15°and 30°. As λb increases, the destabilizing effect of the centrifugal force becomes stronger, leading to the formation of regular large-scale vortices. The structural change of turbulence caused by these vortices affects the distribution of the statistical turbulence quantities significantly. In the outer region, the direction of the shear stress vector does not align with that of the velocity gradient vector. The ratio of the integral lengh scale to the Taylor microscale, L/λ, increases as the destabilizing centrifugal effect increases.
一般社団法人日本機械学会の論文
1995-07-25