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结合新集水利枢纽模型试验,针对其泄洪时水流佛氏数低且发生二次水跃的特点,在消力池尾部设置一定高度的跌坎后,水流过坎形成跌水与二次水跃的联合流态,即坎控底射混合流。通过对跌坎高度(共轭比)的试验比较研究了坎控底混流的运动规律、消能特性及其控制因素。试验结果表明,一次水跃后产生的坎控底混流能有效地改善下游流态及河床流速分布、提高消能效率,且在上下游水位差很小且佛氏数很低的条件下,共轭比对底射混合流的消能率大小起控制作用。
According to the model test of Xinjiu Hydroproject, according to the characteristics of low flow number and secondary water jets in flood discharge, after setting a certain height of fall in the tail of the stilling pool, the water flowed through the ridge to form the water drop and the secondary water jump The combined flow, that is, the KLCI mixed flow. Through the test of the height (conjugate ratio) of falling ridge, the motion law, energy dissipation characteristic and control factors of the mixed flow at the end of the hilly control are studied. The experimental results show that the mixed flow at the end of a water jump can effectively improve the distribution of the downstream flow velocity and riverbed velocity and improve the energy dissipation efficiency. Under the condition of very small water level difference between the upper and lower reaches, Yoke ratio of the bottom-fired hybrid flow rate of energy control play a role.