导流墙半径对氧化沟流场影响的三维数值分析

3-D numerical analysis on influence of guide wall radius on flow in oxidation ditch

导流墙是影响氧化沟内流场的一个重要因素。采用标准k-ε模型和多参考系(MRF)模型,对导流墙不同半径时氧化沟内流速场进行三维数值模拟。结果表明:导流墙半径为0.5 m时,氧化沟内流速最大,曝气机对水流的推动力最大,沟底发生污泥沉积的可能性最小。

Guide wall is an important factor affecting the oxidation ditch flow field. This paper adopts standard model of k-ε and MRF to deal with flows in oxidation ditch with different radius of guide walls through three- dimensional numerical simulation. The results show that the flow velocity in oxidation ditches and the aerator＇ s impetus reach the maximum. Meanwhile, the chance of sludge deposit comes to the minimum when the radi- us of guide wall is 0.5m.