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在引水渠垂直进水口注射染料,首次观察到持续的染色核心旋涡,定义为自由表面弱旋涡。在试验资料的分析中,采用了若干无量纲参数来描述自由表面旋涡流动.试验结果指出:为了避免垂直进水口的弱旋涡,需要大的无量纲淹没深度。大多数垂直进水口将因此需要某种反旋涡装置,以期避免发生弱旋涡,所要求的无最纲淹没深度则随来流角度和引水渠的长宽比而定.
Dyeing at the vertical inlet of the aqueduct was observed for the first time with a persistent dyed core vortex defined as a weak vortex with a free surface. In the analysis of experimental data, a number of dimensionless parameters are used to describe the free-surface vortex flow.The experimental results show that a large dimensionless submergence depth is required to avoid weak vortices at the vertical inlet. Most vertical intakes will therefore require some type of anti-vortex device to avoid weak vortices, and the required minimum depth of submergence will depend on the angle of flow and the aspect ratio of the diversion channel.