不同跌扩组合对扩散式泄槽底流消能水力特性影响研究

Study on the Influence of Different Falling-sill and Expanding Combinations on the Hydraulic Characteristics of Bottom-flow Energy Dissipation of Diffusion Chute

通过水工模型试验,研究跌扩型底流消能工进口接扩散角为3°的扩散式泄槽,在不同跌坎深度、不同边墙突扩宽度的组合下,其消能工内临底流速、时均压强、脉动压强方差值以及尾水渠水流流态的变化情况。结果表明:当跌坎深度由0.05 m增加到0.10 m,边墙突扩宽度由0.30 m增加到0.35 m时,消力池内临底流速降低、时均压强逐渐回升,尾水渠水流较为平顺。进一步增大跌坎深度和边墙突扩宽度,消力池内水力特性和出口水流流态虽继续改善,但效果已不明显。

Through hydraulic model test,this paper studies on the change of inner bottom flow rate,mean pressure,fluctuating pressure variance and tailwater channel flow pattern of energy dissipator under different combinations of falling-sill depth and sudden-expansion side wall width when the inlet of falling-sill and expanding bottom-flow energy dissipator is connected with the diffusion chute with diffusion angle of 3°.The results show that when the falling-sill depth increases from 0.05 m to 0.10 m,the sudden-expansion side wall width increases from 0.30 m to 0.35 m,and for the stilling basin,the inner bottom flow rate decreases,the mean pressure rises gradually,and the flow in the tailwater channel is relatively smooth.By further increasing the falling-sill depth and sudden expansion side wall width,the hydraulic characteristics and the pattern of the outlet flow continues to improve,but the effect is not obvious.