The diversion spillway tunnel is an important stucture in a hydropower station, whose unit discharge is usually larger and Froude number is smaller. Here, the dissipation problem of a diversion tunnel is studied by model tests. The diversion tunnel will be changed into a spillway tunnel, which is a typical “Longtaitou” type of spillway tunnel. Its dissipator will be required to not only meet the requirments of energy dissipation during diversion period, and also meet the requirments of flood discharge and energy dissipation during normal operation period. At last, through the experimental researches for more schemes, a comprehensive energy dissipator with simple structure and easy to construction is obtained,so as to satisfactorily solve the dissipator figure selection and the flood discharge and energy dissipation for this diversion spillway tunnel.%导流泄洪洞是水电站建设中的重要建筑物,通常单宽流量较大,佛氏数较低.通过模型试验研究了一个具体工程的导流洞消能问题,该导流洞后期还要改为泄洪洞,属典璎的"龙抬头"式泄洪洞.要求出口消能工既要满足导流期的消能问题,又要满足正常运行期的泄洪消能要求.通过多种方案的试验研究,最终提出了一种结构简单、施工方便的综合式消能工.从而圆满地解决了该导、泄"二合一"隧洞出口消能工体型选择及泄洪消能问题.
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