Vortices within the Separation Region in a Decelerating Channel Flow (Effect of Inlet Velocity Gradient)

试验性的调查在吸从一面多孔的方面墙产生的速度的隧道流动在流动分离以内被转变为三维的分开的流动和旋涡。沿着方面和底部墙的流动被表面一簇方法设想。狂暴的内部流动被裂口电影探查测量包括反向的流动调查狂暴的流动。在为强壮的速度流动(吸流动 ratio:0.8 ) 的流动可视化，二个典型流动模式或者出现。一个人是底部墙附近的流动在最高的墙附近分开比流动在上游的更多并且一顺时针方向，旋涡能在分离区域被看见。另外一个是有一个逆时针方向的旋涡的颠倒流动模式。由用裂口电影探查的狂暴的流动测量，骚乱水平的二座山峰为强壮的速度流动案例被观察。这些山峰能被联系，二个流动模式上面提及。在分离以内的关键词旋涡 - 速度的隧道流动 - 狂暴的流动 - 裂口电影探查 CLC 数字 O357.

An experimental investigation was made into three-dimensional separated flow and the vortices within the flow separation in a decelerating channel flow generated by the suction from a porous side wall. The flows along the side and bottom walls were visualized by the surface tuft method. The turbulent internal flow was measured by the split-film probe to investigate the turbulent flow including the reverse flow. In the flow visualization for the strong decelerating flow （the suction flow ratio：0.8）, two typical flow patterns appear alternatively. One is that the flow near the bottom wall separates more upstream than the flow near the top wall and a clockwise vortex can be seen in the separation region. Another is the reversal flow pattern with a counterclockwise vortex. By the turbulent flow measurement using the split-film probe, two peaks of turbulence level are observed for the strong decelerating flow case. These peaks can be related with two flow patterns mentioned above.