U型结构中的水体振荡特性

发布时间：2018-06-18 01:12

  本文选题：VOF模型 + 数值模拟　； 参考：《中国农村水利水电》2017年04期

【摘要】：采用FLUENT软件并选用VOF模型(Volume of Fluid model)对U形结构的水体振荡进行二维数值模拟,首先采用吴持恭推导的U形管中水体振荡周期公式验证采用数值模拟得到的结果可靠。然后研究U形结构的振荡特性,上下游横截面积对振荡周期、振荡幅度的衰减及振荡过程中水流流态的影响。结果表明:增大U形结构上游或者下游横截面积会增大水体振荡周期,特别是同时增大上游与下游横截面积,效果更加显著;当中间有压管道的长度增加到一定程度以后,增加横截面积对周期造成的影响趋于一致,可以拟合出相应的公式;增加横截面积,特别是同时增加上下游横截面积造成水体中产生较大的水流漩涡,增大局部水头损失,能显著加快水体振荡的衰减。
[Abstract]:Using fluent software and VOF model volume of fluid model, the 2-D numerical simulation of water oscillation with U-shaped structure is carried out. Firstly, the numerical simulation results are verified by using the formula of water oscillation period in U-shaped tube derived by Wu Canggong. Then, the oscillation characteristics of U-shaped structure, the influence of upstream and downstream cross section area on the oscillation period, the attenuation of oscillation amplitude and the water flow state in the oscillation process are studied. The results show that increasing the upstream or downstream cross-sectional area of U-shaped structure will increase the period of water oscillation, especially the cross-sectional area of upstream and downstream, the effect is more remarkable, when the length of the intermediate pressure pipeline increases to a certain extent, The effect of increasing cross-sectional area on the period tends to be consistent, and the corresponding formula can be fitted, and the increase of cross-sectional area, especially the increase of cross-sectional area of upper and lower reaches at the same time, will result in a large swirl of water flow and increase the loss of local water head. It can significantly accelerate the attenuation of water oscillation.
【作者单位】： 河海大学水利水电学院;
【分类号】：TV135
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本文编号：2033315