【摘要】 采用折射率匹配技术,应用激光多普勒测速仪对突缩和分叉复合管内的液体二维速度场进行了测量。当旁路和主管的流量比为4∶1时,在两管道轴线组成的水平面内,汇流后轴向速度呈不对称双峰状,流动偏向正对旁路来流的主管道壁面一侧。在铅垂面内,轴向速度分布呈M型。在管道横截面内,存在着一对方向相反的漩涡结构,在汇流中心区域最为明显。更多还原

【Abstract】 Two-D liquid velocity field in a tube with a combination of a stenosis and a bifurcation was measured with refractive index matching technique using Laser Doppler Velocimeter(LDV).The flow ratio of main tube to bypass was 1∶4.It is found that the axial velocity profile has two peaks in the XOY plane which is skewed to the main tube wall facing the flow from the bypass,and it manifests itself in the form of "M" in the XOZ plane.A two counter-rotating vortices in the main tube cross section downstream the conjunction region is also detected.更多还原