不同进口高度排水管道用涡流装置截流特性模拟与试验

发布时间：2018-01-30 05:49

  本文关键词： 涡流 水利设备 进口高度 瞬态数值模拟 截流特性 内部流动特性 试验验证　出处：《农业工程学报》2017年22期 　论文类型：期刊论文

【摘要】：为研究不同进口高度h的涡流截流装置的截流特性,选用瞬态不可压缩流动的N-S方程和重整化群RNG k-ε湍流模型,采用欧拉模型中的VOF(volume of fluid)法对涡流截流装置进行了数值模拟,分析了进口高度h对涡流截流装置截流特性、截流效率的影响,并且研究了涡流装置内部流场分布特性,同时对涡流截流装置的截流特性进行了试验验证。结果表明,进口高度越小,截流能力越强;涡流截流装置的截流效率,随着高度h增大先减小后增大,转折点在3h/5~4h/5之间;当进口宽度固定时,为了保证不发生溢流或者堵塞,且能够实现较好截流,涡流截流装置的进口高度应选择4h/5~5h/5之间,此时,涡流装置的进口截面面积大于出口截面面积。涡流截流装置的截流主要是因为在装置内部形成了局部低压,静压力转换为流体运动的动压力,使流体产生高速旋流,发生了旋流截流。该研究可为城市污水截流装置提供新的可选设计方法,降低污水溢流或者内涝发生率。
[Abstract]:In order to study the closure characteristics of eddy current interceptor with different inlet height h, the N-S equation of transient incompressible flow and the RNG k- 蔚 turbulence model of renormalization group were selected. The VOF(volume of fluidmethod in the Euler model is used to simulate the eddy current interceptor, and the characteristics of the inlet height h are analyzed. The effect of the closure efficiency on the flow field distribution in the eddy current device is also studied. The experimental results show that the smaller the inlet height, the stronger the closure capacity. With the increase of height h, the closure efficiency of eddy current interceptor first decreases and then increases, and the turning point is between 3 h / 5 h and 4 h / 5; When the inlet width is fixed, in order to ensure that there is no overflow or blockage, and to achieve better closure, the inlet height of the vortex closure device should be between 4 h / 5 h / 5 and 5 h / 5. The inlet cross section area of the eddy current device is larger than the exit section area. The main reason for the vortex closure device is that the local low pressure is formed inside the device and the static pressure is converted to the dynamic pressure of the fluid movement. This study can provide a new alternative design method for urban sewage interceptor and reduce the incidence of sewage overflow or waterlogging.
【作者单位】： 水利部杭州机械设计研究所(水利部产品质量标准研究所);水利机械及其再制造技术浙江省工程实验室;
【基金】：浙江省公益技术应用研究项目(2017C33010) 水利部公益性行业科研专项经费项目(201501026)
【分类号】：TV134
【正文快照】： 0引言随着社会的进步,工业企业排放的污染性气体、汽车尾气等会形成大气干沉降,累积在地表上,沉积在管道中,随着降雨,这些污染物会随着雨水的冲刷进入水体对水质产生污染[1-3],使得城市雨水管道污染问题变得更加严重。因此,如何控制城市强降雨雨水污染问题及加大雨水利用率已，

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