1735 変動流入風条件下の尾根地形周り境界層の非定常特性(S34-4 自然流体エネルギーの利用技術(4),S34 自然流体エネルギーの利用技術)

概要

論文の詳細を見る
Effects of inflow turbulence on a turbulent boundary layer developed in front of a 2-dimentional steep hill have been experimentally investigated with a wind tunnel. Using an active turbulence grid, the turbulence intensity and length-scale involved in the inflow were varied. The 2-component instantaneous velocities in the boundary layer were measured with an X-type hot wire, and turbulence statistics, including higher order moments, were accumulated. Through the measurements, it was found that the large-scale velocity fluctuation of inflow directly affects on the turbulence characteristics in the near-wall region of a flat plate boundary layer. On the contrary to this, the large-scale fluctuation caused by inflow turbulence disappears and the turbulence behavior becomes to be independent of inflow turbulence in the boundary layer near the hill.
2007-09-07