关键词: 窄缝消能工, 急流冲击波, 收缩比, 水流弗氏数, 挑距

Abstract: By changing the inflow Froude number Fr and the contraction ratio β of narrow slit in model experiments, we researched the confluence location of rapid shock waves and the diffusion regularity of flow out of the slit-bucket. Results show that β has larger influence on the confluence location of rapid shock waves than Fr does; the larger β is, the closer the confluence location is to the flip bucket outlet. After the shock waves meet, the surface water in the bucket starts to shoot, and the outflow angle reduces correspondingly as β increases. When β=0.2~0.25,the confluence location of shock waves is 9.5~11.5 m away from the outlet of flip bucket, in which case the water tongue diffusion is more sufficient and stable. The research results enriched the understanding of hydraulic characteristics in slit-type bucket, and provide a theoretical basis for relative design.

Key words: slit-type energy dissipator, rapid flow shock wave, contraction ratio, Froude number, jet trajectory length