浮体结构对下游水流结构影响

Influence of floating structure on the flow structure of downstream water

采用物理模型试验研究流动水域中浮体结构对下游水流流动结构的影响,对不同长高比浮体结构及其在不同水位差条件下浮体结构下游水流结构特征断面的流速分布、流速不均匀系数以及回流区长度进行分析。结果表明:浮体结构体型的变化对流速分布及流速不均匀系数的影响并不明显,水位差对两者均有较大的影响,其影响随着水位差的增大而增大;回流区长度受浮体结构体型以及水位差影响均较敏感,在实际运用中,应该主要关注水位差变化引起的水流流动结构的变化。

The influence of floating structure on the downstream flowing structure in the flowing water was studied by using a physical model test.By comparing the flowing structures under different aspect ratios and water levels,the flowing velocity distribution,non-uniform coefficient and the length of recirculation zone of the characteristic cross section were analyzed.The results show that the influence of aspect ratios on the velocity distribution and the non-uniform coefficient is not obvious,while the water-level difference has a great influence and it shows an increasing trend with the increase of water level.At the same time,the length of recirculation zone is more sensitive to the aspect ratio and water level.In the practical engineering,attentions should be paid to the engineering problems caused by the change of water level.This study can provide references for the design of floating structure as well as the change rule of downstream flowing structure in current during the process of running.