水平旋流泄洪洞的综合水力特性

通过模型试验,研究了水平旋流泄洪洞的基本流态、基本水力特性、流速分布与压强分布特性。水平旋流泄洪洞的流态可分为自由流、吸吮流和淹没流三种基本流态,各种水力特性的变化均与流态有关,也具有明显的分区特性。水平旋流洞切向流速沿径向的分布可以看成组合涡分布,轴向流速为最大值靠近壁面一侧的二次曲线分布。流速和壁面压强分布随上下游水位的变化趋势在各种流态下是相同的,但在具体规律上因流态不同而有较大的差异。

Synthetical Hydraulic Characteristics of Level Rotary Flow Discharge Tunnel

The basic flow patterns and hydraulic characteristics,flow velocity and pressure distribution characteristics,have been investigated on a model of the level rotary flow discharge tunnel.The basic flow pattern can be divided into three kinds,respectively known as the free,suction and submergence flows,and the changes in all hydraulic characteristics are closely related to flow patterns and obviously characterized by zonifications.The tangent velocity along the radius distribution in the level rotary flow tunnel can be considered as the combination swirl distribution,and the axial flow velocity can be the conic section distribution with the maximum value nearing one side of the wall.The changing tendency of flow velocity and wall pressure distribution with the variations in the upstream and downstream water levels is the same under the different flow patterns,but there are great differences in concrete distribution laws because of different flow patterns.