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现有水电站最小临界淹没水深的计算公式仅针对于单管单孔进水口,本文旨在研究双层进水口的水力特性,以获得其临界淹没水深的经验公式。通过水力模型试验,提出虚拟当量管道的概念,由此拟合得出双层进水口的最小淹没水深公式。结果发现,双层进水管的临界淹没水深试验值比Gordon公式计算值大,但两条拟合曲线的斜率较接近。研究可得Gordon公式仅适用于单管单孔进水,而不适用于双层进水管引水的情况,本文拟合所得经验公式可为双层进水口的临界淹没水深设计提供一定的参考。
The calculation formula of the minimum critical submerged depth of the existing hydropower station is only for the single-hole single-hole inlet. This paper aims to study the hydraulic characteristics of the double inlet and obtain the empirical formula of the critical submerged depth. Through the hydraulic model test, the concept of virtual equivalent pipe is put forward, and the formula of the minimum submerged water depth of double inlet is obtained by fitting. The results show that the critical immersion depth of double inlet pipe is larger than Gordon’s formula, but the slope of two fitting curves is close. The study shows that Gordon’s formula is only suitable for single-hole single-hole water inflow, but not suitable for double-inlet water diversion. The empirical formula obtained from this paper can provide some reference for the design of critical submerged water depth of double inlet.