溢洪道掺气设施和挑坎体型模型试验

Spillway aeration facilities and bucket body model test

对拟建的LZP水库溢洪道进行水工模型试验研究,结果表明:原方案中掺气槽的设计位置不佳,致使水流无法进行充分调整、掺气保护长度不能被充分利用;原设计挑坎体型欠妥,由于溢洪道出口位置河道狭窄且溢洪道轴线与河道夹角过大,出射水舌对河道右岸有严重冲刷现象。针对以上工程问题,提出上移掺气槽与底板镂空异形挑坎两个方案,并分别进行优化试验,研究结果证明:底板镂空异形挑坎方案对出射水舌的纵向拉伸效果较好,避开了右岸边坡且水流流态也更趋稳定;调整后的掺气槽布置位置合适,空腔形成良好,能够充分发挥功效。

For the proposed LZP reservoir spillway hydraulic model tests, the results show the design position of the aeration tank in the original scheme is not good, resulting in water flowing not be fully adjusted, gas protection length not be fully utilized.The original design bucket type is defective, because of the river at the spillway outlet position is narrow and the angle between the axis of the spillway and the river is big.A jet is of serious scouring phenomenon on the right side of the river channel. In view of the above engineering problems, the paper puts forward the two schemes of uplifting the aerated tank and the bottom platehollow-shaped ridge, and the optimization experiments are carried out respectively. The results show that the bottom plate scheme is better for the longitudinal tensile effect of the water jet and avoids the right bank slope and the water flowing state is more stable. After adjusting, the position of the air chamber is suitable, the cavity is formed well, and can be put into fullplay.