宽尾墩后接阶梯溢流坝面水工设施的研究

将宽尾墩安置在阶梯溢流坝上游形成一种新的水工设施,它兼有宽尾墩和阶梯溢流坝面的特点,比纯阶梯坝单宽流量可增大数倍。由于在阶梯面与挑射水流之间形成气体空腔,可实现充分掺气。本文对其进行了数值模拟,采用了双孔方案。虽然网格数增加了一倍,但比单孔而言流场更加完整。通过数值模拟得到的墩后水翅、阶梯面挑射水舌和掺气腔体等,与实验观测到的现象吻合。介绍了复杂水工建筑物的网格生成方法。本文的研究成果可以为设计提供参考依据。

Study on hydraulic structure of flaring gate piers locating at the upstream of stepped spillway

A new-style hydraulic structure has the configuration of the flaring gate pier locating at the upstream of the stepped spillway.This structure has advantages of both flaring gate pier and steeped spillway.Its discharge per unit width increases several times than that resulted from a structure with only stepped spillways.In there it forms an aerated cavity between the step surface and the free jet to improve aerification.The numerical simulation is presented in this paper.The simulated structure has two piers to obtain more information of the flow field at the cost of doubled number of meshes.The water wing,the nappe and the aerated cavity are obtained by numerical simulation. The computed results are in agreement with the phenomena in experiment,which has not been reported in the relative literatures.In addition,meshing method of this simulated structure is described in this paper.The studied results may offer reference for designs.