论文部分内容阅读
本文认为双层闸的泄流能力与平底闸基本接近,并分别提出双层、表孔、底孔等单独过水的计算公式及其相应参数,计算值与实验值较吻合。当底孔下游为自由出流时,有较大负压,但出口压低15～20%,负压基本消除;其它所有过水情况,基本无负压。双层和底孔分别过水,当上游水位较低时,闸室内有表面旋滚;水位较高时,双层过水堰面有“水冠”,底孔过水闸室有涌浪、立轴漏斗旋涡等;分流体上移,可改善;表孔过水流态较好。其它闸前淤积,消能冲刷、闸门运用等;均可得到改善或介决。
This paper considers that the discharge capacity of double gate is basically close to that of flat bottom gate, and the calculation formulas and their corresponding parameters of single over-water such as double layer, surface hole and bottom hole are respectively proposed. The calculated values are in good agreement with the experimental data. When the bottom of the hole for free outflow, there is a greater negative pressure, but the export pressure down 15 ~ 20%, the negative pressure is basically eliminated; all other water conditions, the basic no negative pressure. Double and bottom holes were over the water, when the upper reaches of the water level is low, the chamber has a surface spin; water level is high, the double supercritical water surface has “water crown” Funnel vortex, etc .; sub-fluid moved up, can be improved; surface water flow better. Other deposition before the gate, energy erosion, gate use, etc .; can be improved or decided.