一种环保的水下封闭扩散式铺砂装置的水力方案设计

在填海造地工程中需要通过吹填完成水下铺砂,以往的施工工艺在进行水下铺砂时容易造成水体污染,同时吹填区铺砂浓度与砂土粒径分布很不均匀。介绍一种环保的水下封闭扩散式铺砂装置,该装置根据水动力学原理设计,采用封闭的扩散式加内部导流板的结构形式,实现水下大面积高效率环保铺砂作业。该水下封闭扩散式水力铺砂装置由进口段、扩散段和内部导流板组成。采用计算流体动力学(CFD)方法,以清水为介质对铺砂装置内部流动进行数值模拟,分析不同导流板设置对铺砂装置流动特性、铺砂均匀度的影响。最终设计的水下铺砂装置具有施工环保、结构简单、单程铺砂面积大、铺砂效率高、铺砂均匀等优势。

Hydraulic scheme design of an environment-friendly underwater closed diffusion sanding device

In the reclamation and land reclamation project,underwater sanding is required to be completed by blow-filling.In the past,construction techniques used during underwater sanding were likely to cause water pollution.At the same time,sand concentration and sand particle size distribution in the sand fill area were very uneven.This paper introduces an environment-friendly underwater closed diffusion sanding device,which is designed according to the principle of hydrodynamics,adopts a closed diffusion-type structure with internal baffles to achieve large-area,high-efficiency,as well as environment-friendly sanding operations.The underwater closed diffusion type hydraulic sanding device consists of an inlet section,a diffusion section and an inner baffle plate.The computational fluid dynamics(CFD)method is used to simulate the internal flow of the sanding device with clear water as the medium,and the influence of different baffle plates on the flow characteristics and sanding uniformity of the sanding device is analyzed.The final designed underwater sanding device has the advantages of environment-friendliness during construction,simple structure,large single-sand sanding area,high sand-laying efficiency,uniform sand distribution,etc.