开度对各体型弧形闸室突跌后空腔长度的影响

Influence of Opening Degree on Cavity Length of Radial Sluice Behind Vertical Drop of Sluice Chamber

空腔的长短对于高水头、大流量泄水建筑物的掺气减蚀效果具有重要影响,为研究不同体型弧形闸室突跌后开度对空腔长度的影响,利用控制变量法,通过物理模型试验,研究了不同体型弧形闸室在不同开度e与水位h下的空腔长度L_d。试验结果表明,随着闸门体型的变化,其空腔长度有明显改变,且空腔长度与弧形闸门和底板的夹角α_0呈负相关关系;闸门开度越小,弧形闸门对空腔长度的影响越大,因此设计时应充分重视小开度时,不同体型对空腔长度变化的影响。试验成果可为实际工程设计提供参考和指导。

The length of the cavity has an important influence on erosion reduction effect for gas with high head and large discharge release structure.In this paper,by using the physical model experiment and control variable method,we have tested and discussed the length of air cavity under different radial sluice and different gate opening.The experimental results show that with the change of radial sluice,the length of air cavity is changed obviously,and the length of air cavity is negatively correlated with the angle α_0 of the radial sluice.When the gate opening is small,the influence of shape is more obvious.Therefore,we should pay attention to the impact of small opening on the cavity length.The experiment can provide reference and guidance for the engineering design.