推流器布置对氧化沟流场特性的影响

发布时间：2018-12-15 03:04

【摘要】：针对环形跑道式氧化沟污泥沉积现象,在池形结构不变的前提下,改变推流器的布置位置,以STARCCM+软件为仿真平台,采用多面体网格划分方式,调用标准k-ε湍流模型,对4台推流器同时开启状态下进行全流场模拟.分析流道各断面的速度分布、整体流场的流速分布以及流场死区率(速度低于某一值所占区域的比例),寻找适合于该池型结构的推流器最优布置方式.结果表明:推流器的安装位置对流速的分布至关重要,其与中间导流墙的间距偏大或偏小都会导致流场速度分布不均匀,死区率较高,而当其间距为环形导流墙半径与偏置距离之和的0.85倍时,整体的流速分布最为均匀,主要断面的平均流速较高,且均在0.35 m/s以上,死区率最低;在环形导流墙背后以及中间导流墙的两端不可避免地会出现脱流区域,但可以通过改变推流器位置进行改善;在氧化沟的弯道处受推流以及壁面阻碍作用有明显的涡旋现象.
[Abstract]:In view of sludge deposition phenomenon in annular runway oxidation ditch, under the premise of the same cell structure, the location of pushers is changed. The standard k- 蔚 turbulence model is called by using polyhedron mesh division mode and STARCCM software as simulation platform. The full flow field simulation of four pushers is carried out under the condition of simultaneous opening. The velocity distribution of each section of the channel, the velocity distribution of the whole flow field and the dead zone rate of the flow field (the proportion of the velocity less than the region occupied by a certain value) are analyzed. The results show that the location of the impeller is very important to the velocity distribution, and the large or small distance between the impeller and the intermediate diversion wall will lead to the uneven velocity distribution of the flow field and the higher dead zone rate. When the spacing is 0.85 times of the sum of the radius of the annular diversion wall and the offset distance, the velocity distribution of the whole is the most uniform, the average velocity of the main section is higher than 0.35 m / s, and the dead zone rate is the lowest. It is inevitable to deflow behind the annular diversion wall and at the two ends of the intermediate diversion wall, but it can be improved by changing the position of the impeller, and there is a clear vortex phenomenon at the bend of the oxidation ditch and the obstruction of the wall.
【作者单位】：合肥工业大学化工机械研究所;南京蓝深集团;
【基金】：安徽省合肥工业大学“秋实计划”A类计划项目中央高校基本科研业务费专项资金资助项目
【分类号】：X703

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