潜水搅拌机分布对污水处理池搅拌效果的影响

为研究潜水搅拌机的分布对污水处理池内搅拌效果的影响,采用三维建模软件 Pro／E建立实体模型,利用ICEM大型软件对污水处理池进行非结构化四面体网格划分,在 Fluent 63计算流体力学软件平台上,采用动坐标系技术、RNG k-ε湍流模型和PIOS算法,对潜水搅拌机搅拌的污水处理池进行数值模拟,分析全池内流体的宏观流场与各截面速度流场分布,考察各潜水搅拌机的效率,同时对污水处理池内的流体平均速度及搅拌面积率进行了研究．计算结果表明:优选方案H中,3个潜水搅拌机转速为1 200 r／min,安装角度分别为45°,30°,30°,其搅拌面积率超过90％．在3个潜水搅拌机搅拌下,污水处理池内流体形成连续循环水流,搅拌充分,平均流速在0.3 m／s左右,符合潜水搅拌机工作要求．利用此方法,可为潜水搅拌机的实际工程应用提供参考依据．

Mixing effect in sewage treatment pool by distribution of submersible mixers

To study mixing effect in sewage treatment pool by distribution of submersible mixers, with a 3D model built through Pro/E software and an unstructured tetrahedron grid of sewage treatment pool built through ICEM software, on the platform of computational fluid dynamics software Fluent 6.3, applying dynamic coordinate system technology, RNG k-ε turbulent model and PIOS algorithm, a numerical simulation of sewage treatment pool with submersible mixers was conduced. The global fluid field and every section velocity flow field distribution were analyzed. The efficiency of each submersible mixer was observed. The average fluid velocity and mixing area in the sewage pool were studied at the same time. The results show that in the optimal project H, the speed of three submersible mixers is 1 200 r/min, and their stagger angles are 45°, 30°, 30°, respectively, with the fluid mixing area in the pool reaching more than 90%. Under the operation of three mixers, the fluid in the sewage pool forms a continuous circulating water flow,with the fluid being adequately mixed and the average fluid velocity at around 0.3 m/s, satisfying the mixer′s work requirements. This method can provide a reference basis for practical engineering application of submersible mixers.