C142 主流の乱れと圧力こう配が乱流温度境界層に及ぼす影響(C-14 乱流熱物質移動および反応流(2),一般講演)

概要

論文の詳細を見る
Interaction between wall-bounded shear flow and free shear flow is an important issue to assess the turbulence theory and existing turbulence models. We have experimentally investigated the effects of free-stream turbulence (FST) on turbulent thermal boundary layer developing along a uniformly heated flat plate with and without streamwise pressure gradient. Active turbulence grids with counterflow jets located in the settling chamber are used to generate the FST whose intensity and length scale are about 2% and 1.4δ_<99> (boundary layer thickness at a measurement location), respectively. It is confirmed that the FST reduces the wake components of both mean velocity and temperature profiles, although the adverse pressure gradient has little effect on the thermal field. The local wavelet spectra reveal that the strong interaction, consisting of the near-wall turbulence with high frequency and FST with low frequency, occur intermittently.
日本流体力学会の論文
2004-08-09