水平旋转内消能泄洪洞流速分布及紊动特性试验研究  

Experimental study on velocity distribution and pulsation characteristic of inner dissipation discharge tunnel with level swirling flow

作　　者：汪振[1] 牛争鸣[2] 李嘉[3] 

机构地区：[1]华东勘测设计研究院,浙江杭州310014 [2]西安理工大学,陕西西安710048 [3]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065

出　　处：《水动力学研究与进展（A辑）》2007年第3期325-331,共7页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金(50479025);水力学及山区河流开发保护国家重点实验室开放基金(0302)

摘　　要：该文通过模型试验,研究了在自由流、吸吮流和淹没流三种基本流态下,水平旋转内消能泄洞的流速分布与脉动特性。激光测速的结果表明,水平旋流洞的切向流速沿径向的分布可以看成是组合涡分布,轴向流速沿径向的分布可看成是最大值靠近壁面一侧的二次曲线分布。在流速的变化趋势上各种流态是相同的,但具体分布参数因流态不同,有较大的差异。流态不同时,轴向脉动流速与切向有较大差异,湍流强度变化规律也不同,自由流与吸吮流流态湍流强度总体上的变化规律为Twθ和Twz沿程均有所增大;沿径向先减小,在R/R0大于一定值之后基本维持一常量或略有增大。Through the model experiment, the velocity distribution and pulsation characteristic of inner dissipation discharge tunnel with level swirling flow were studied in three kinds of basic fluid states, including freedom flow state, suction flow state and submergence flow state. Measuring results of velocity using LDV indicates that the tangent velocity along the radius shows Rankine swirl distribution, and the axial velocity along the radius shows conic section distribution with its maximum value near the wall for the level swirling flow discharge tunnel. The varying tendency of flow speed in three kinds of fluid statesis similar, but the respective distribution parameters have obvious difference. For the three different states, their axial pulsation speeds and tangential have big difference, the change rules of turbulence intensity are also different. The general change rules of turbulence intensity in freedom and suction flow state are： the intensity increases along the length, and reduces along the radial direction first, but turbulence intensity maintains constant or slightly increases when R/RO is bigger than a certain value.

关 键 词：水平旋转 内消能泄洪洞 模型试验 激光测速 流速分布 

分 类 号：TV135.2[水利工程—水力学及河流动力学]