不同安放角度对污水搅拌器水力特性的影响

为深入对比污水处理池中搅拌器不同安放角度对其水力特性的影响,文中基于Fluent对搅拌器在不同安放角度下的水力特性进行数值模拟,得出适合搅拌器工作的较优工况.利用标准k-ε湍流模型及 SIMPLEC 算法对不同工况进行模拟,对比相应的流速分布和搅拌器中心所在平面的速度分量.结果表明:当搅拌器安放角度为-15°时,处理池内平均流速较高该工况下处理池内平均流速较高且搅拌器消耗的功率较小.通过分析搅拌器安放位置中心横断面的速度分量发现,经过搅拌器的水体呈现螺旋状向流向方向发展;在直角坐标系中3个方向速度分量各不相同.在搅拌器安放角度为-15°时,水体流速在轴y,z分量较大且不与墙体冲突.因此,在实际应用中适当改变搅拌器的安放角度,可以有效改善水体循环流动,优化搅拌器的搅拌效果,研究结果可为潜水搅拌器的实际工程提供参考.

Influence of placement angle of sewage mixer on its hydraulic characteristics

In order to deeply compare the influence of different placement angles of agitators on the hydraulic characteristics of sewage treatment tanks, the hydraulic characteristics of agitator under different placement angles based on Fluent are simulated, tand the optimal working conditions for agitator are obtained. The standard k-ε turbulence model and SIMPLEC algorithm were used to simulate the corresponding velocity distribution and the velocity components in the plane where the center of the agitator is located are compared. The results show that the average flow velocity in the treatment tank is higher and the power consumption of agitator is smaller when the placement angle is -15°. By analyzing the velocity component of the central cross-section of the placement position of the agitator under five working conditions, it is found that the water passing through the agitator develops in a spiral direction towards the direction of flow direction. In Cartesian coordinate system, the velocity components in three directions are different. When the placement angle is -15°, the velocity component of fluid on the y and z axes is larger, and does not conflict with the wall. Therefore, in practical application, by appropriately changing the placement angle of the agitator can be effectively improve the circulation flow and the mixing effect of the agitator can be optimized. The research results can provide reference for practical engineering of submersible.