不同池形中推流搅拌器功率消耗的数值模拟

利用FLUENT 6.0大型计算流体力学软件,采用非结构化四面体网格,动坐标系技术,k-ε湍流模型和SIMPLE算法,对城市污水处理中,矩形、直圆管、渐进圆管和突变圆管等4种池形的水池进行了全池数值模拟.分析了池内流体的速度场,并对不同水池中污水处理搅拌器消耗的功率进行了数值计算与分析,对其性能进行了预测.计算研究发现,在满足规范的池内整体流速条件下,渐进圆管水池中搅拌器消耗的功率最小;直圆管水池内流体流动较为稳定,渐进圆管水池内流体流动效果次之,突变圆管水池内的流体流动效果最差.因此,渐进圆管水池和直圆管水池是较理想的污水搅拌水池.

Numerical simulation of mixer power consumptions in different ponds

Four different ponds were simulated by FLUENT 6.0,using unstructured-tetrahedron grid and MRF technology with k-ε turbulence model and SIMPLE algorithm. In urban wastewater treatment, rectangular pond, circular pond, evolution pond and sudden change pond were simulated. The flow velocity fields in the ponds were analyzed, the powers were studied, and the performances of these ponds were forecasted. Results show that mixer′s power consumotion is the smallest in the evolution pond, in the sudden change pond the fluid flow is the worst, and in the circular/ evolution pond the fluid flow is better. The circular/ evolution ponds are suitable for the mixer.