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通过模型试验和理论分析， 研究了低Ｆｒ 数（ Ｆｒ＜ ７） 流动情况下空腔积水对跌坎掺气设施水力及掺气特性的影响． 建立了计算跌坎掺气设施水力及掺气特性的预测数学模型． 给出了射流出射角的修正式； 积水尺寸的计算式； 掺气设施实际运行工况（ 空腔长度、空腔负压、掺气量等） 的预估方法． 研究表明， 低Ｆｒ 数流动情况下， 由于重力作用显著， 积水对水力及掺气特性均有显著影响．
Through the model test and theoretical analysis, the effect of cavity water accumulation on the hydraulic characteristics and aeration characteristics of the aeration facilities at the down-dip was studied under the condition of low Fr-number (Fr <7). A mathematical model of predicting the hydraulic and aeration characteristics of the aeration facilities in the depression is established. The correction formula of the jet exit angle is given. The calculation formula of the water storage size is also given. The estimation method of the actual operating conditions of the aeration facility (cavity length, cavity negative pressure, aeration volume, etc.) Is given. The results show that, under the condition of low Fr flow, the hydrocyclone has a significant effect on the hydraulic and aeration characteristics due to the significant gravity effect.