突扩突跌掺气坎底空腔长度计算  

Calculation of the Bottom Cavity Length of Aerator with Sudden Lateral Enlargement and Vertical Drop

作　　者：刘超[1,2] 李龙国[1,2] 李乃稳[1,2] 庄文化[1,2] 刘慧芬[2] 

机构地区：[1]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065 [2]四川大学水利水电学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2015年第4期1-5,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(51009102)

摘　　要：突扩突跌掺气坎的底空腔长度既与水力条件和底部掺气坎结构参数有关,也与侧墙掺气坎结构参数有关。以往的底空腔长度计算方法,均针对仅采用底部掺气坎,未设置侧墙掺气坎这类掺气设施,不能反映出侧墙掺气坎结构参数对底空腔长度的影响。基于射流微元体受力平衡法,提出了一种求解明流泄水道突扩突跌掺气坎底空腔长度的计算方法,该方法能够全面反映突扩突跌掺气坎底空腔长度受底部掺气坎、侧墙掺气坎结构参数和水力学参数的影响。通过与30组试验资料和已有研究成果的对比,表明所提出的计算方法具有较高的精度。For an aerator with sudden lateral enlargement and vertical drop in free flow chute, the bottom cavity length is governed not only by hydraulic parameters, but also by structural parameters of the bottom aerator and lateral aerator. The previous calculation method for the bottom cavity length failed to consider the effect of lateral aerator＇ s structural parameters. Based on the hydrodynamic analysis of micro water unit of jet flow from aerator,a new calculation method for the bottom cavity length of jet flow from chute aerators with sud- den lateral enlargement and vertical drop was obtained, which considers overall effects of the above mentioned parameters. The compari- son with 30 groups of experimental data and existing research results showed that the calculating method proposed in this paper has higher accuracy.

关 键 词：掺气减蚀 掺气坎 空腔长度 突扩突跌 侧掺气 

分 类 号：TV131.4[水利工程—水力学及河流动力学]