台阶式泄洪槽水工模型试验研究

为验证山西省某森林公园台阶式消能泄洪槽设计的合理性,通过模型试验研究了该消能泄洪槽不同流量工况下的流态、台阶平面压力、流速分布及消能效率。结果表明,在试验流量范围内,泄槽内为跌落水流和过渡水流,掺气不明显;台阶平面压力变化范围为-9.7~24.4kPa,当流量为6m^3/s时,出现最大负压9.702kPa;除#3消力池进口处外,三段台阶式消能段均为泄槽底部流速较小,对泄槽底部冲刷较小,泄槽水流表面流速最大;在不同流量下台阶式泄槽+消力池联合消能率均超过了90%,其中大部分能量消散在溢洪道台阶上。研究成果可为类似工程提供参考。

Hydraulic Model Test and Research on Stepped Discharge Chute

In order to verify the rationality of the design of a stepped discharge chute in a forest park in Shanxi Province, the flow pattern, step pressure, velocity distribution and energy dissipation efficiency of the channel under different discharge conditions were studied by model test. The results show that within the range of test flow rate, there is nappe flow and transition flow in the chute, and aeration is not obvious. The pressure variation range of the step plane is -9.7-24.4 kPa. When the flow condition is 6 m3/s, the maximum negative pressure is 9.702 kPa. Except at the entrance of the #3 stilling basin, the three step energy dissipation sections all have a lower velocity at the bottom of the chute that scour the bottom of the chute, and a higher velocity at the surface of the flow. At different flow conditions, the combined energy dissipation rate of the stepped chute and the stilling pool exceeds 90%, and most of the energy dissipates on the spillway steps. The research results can provide reference for similar projects.