中文摘要：

融合扩散坎、窄缝坎和差动坎三种挑流型式的优点为一体形成高扩散低收缩差动挑流消能工,不仅适用于高水头大流量宽浅式岸边溢洪道,在狭窄河谷高拱坝亦可应用,具有鲜明的工程应用特色。本文通过模型实验,对该型式挑坎的泄洪流态、高低坎坎内压力分布、挑射水舌运动特性及下游冲坑形态进行研究,并与连续坎、窄缝坎及矩形差动挑坎的水力特性进行了对比分析,结果表明高扩散低收缩差动式挑流消能工在侧壁位置未出现负压区,可提高该挑坎在高水头应用条件下抗空蚀破坏性能,其挑射水舌入水面积最大,较之窄缝坎,最大冲坑深度可减小约20%,且当入坎处弗氏数5.27〈Fr〈6．0时，冲坑深度随着Fr增大而减小。

英文摘要：

This paper focuses on an experimental study of hydraulic performances of a new type dissipator, which combines the advantage of diffused bucket, contracted bucket and hybrid type bucket. Experiments were conducted on 1：60 scale laboratory models of four bucket types, continuous flip bucket, contracted bucket, hybrid type bucket and combined bucket. The flow regime, jet trajectory and pressure distribution on the bottom and side face of the buckets were studied. The results of combined bucket indicate that as a result of its lower bucket contraction, its side face pressure is positive and flow cavitation can be avoided. An important observation on this bucket is that in the Froude number range from 5.27 to 6. 0 its scour depth decreases with Froude number, with a depth reduction of roughly 20% compared with that of contracted flip bucket.