燕尾挑坎近端水流挑射特性试验研究
Experimental Research on the Characteristics of Water Jets at the Proximal End of the Dovetail-shaped Flip Bucket
作者：王正(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)；邓永婷(四川天府新区成都管委会，四川 成都 610213)；杨正丽(四川大学 水利水电学院，四川 成都 610065)；邓军(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)
Author：WANG Zheng(State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ., Chengdu 610065, China)；DENG Yongting(Chengdu Management Committee of Sichuan Tianfu New Area, Chengdu 610213, China)；YANG ZhengLi(College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China)；DENG Jun(State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ., Chengdu 610065, China)
收稿日期：2019-11-08 年卷（期）页码：2020,52(6):177-182
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：模型试验;燕尾形挑坎;近端水流出射角;內缘挑距
Key words：experimental study;dovetail-shaped flip bucket;takeoff angle of lower jet trajectory;horizontal distance of lower trajectory
基金项目：国家自然科学基金重点项目（51939007）；四川省科研计划项目（2019JDTD0007）
中文摘要
通过物理模型试验，对不同来流条件下燕尾形挑坎近端水流挑射特性进行了研究，分析了挑坎前的断面平均流速、断面水深对近端水流挑射特性的影响，获得了近端水流挑射特性，尤其是近端水流出射角的变化规律。基于不同水流条件下系列试验数据分析，揭示了水流佛汝德数对燕尾坎内缘水流出射角的影响规律；结合自由抛体空中运动，建立了燕尾坎内缘挑距计算方法，计算结果与试验测量及不同研究资料结论的符合较好，说明研究对于近端水流出射角与挑距的计算方法能够为燕尾形挑坎的工程应用和下游水垫消能设计提供必要的参考。
英文摘要
The experimental study investigates the takeoff characteristics of lower jet trajectory from the dovetail-shaped flip bucket under different inlet conditions. The experiment analyzes the influences of velocity and water depth on lower takeoff characteristics, especially the variation of takeoff angle of lower jet trajectory. The following items are addressed: 1) relationship between takeoff angle of lower jet trajectory and inlet velocity as well as inlet water depth; 2) characteristics of the takeoff angle as a function of changes of inletFr0; 3) the empirical formulas for calculating takeoff angle of lower jet trajectory. The results indicate that the effects of inlet conditions are significant on lower takeoff characteristics. Additionally, with the established empirical formulas, the calculated values of horizontal distance of lower nappe profile are in good agreement with the experimental data.
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