窄缝式消能工的水力特性及其体型研究

Hydraulic characteristics of narrow-slotted energy dissipator and its form

研究窄缝坎挑流的水流特性、消能要求及其体型参数的选择 .窄缝使水舌出流挑角增大 ,水舌纵向拉开 ,形成水流变形耗能 ,且加剧了水流紊动、水舌破碎而掺气的耗能 ,使消能效果增加 ,冲刷减少 .提供了不同收缩比与水舌出流挑角变化关系的试验成果及水舌纵向拉开值的估算公式 .

Described are the characteristics of the water flow from the narrow-slotted flip bucket, the requirement of energy dissipation and the determination of form parameters. The narrow slot enlarges the nappe angle, and the longitudinal extension of the nappe results in flow deformation, and increases energy dissipation by flow turbulence, nappe separation and flow aeration, improving the effect of energy dissipation and decreasing the scouring. The experimental results of the relationship between the shrinkage ratio and the nappe angle change are given, and a formula is derived for estimation of the longitudinal extension of the nappe.