摘要
为了研究潜水自引气曝气机内部流动机理,根据潜水自引气曝气机的性能要求,自主设计了开放式齿形转轮和开式导叶,通过三维造型软件UG完成了过流部件的三维造型.以商业软件An-sys-CFX为主要分析工具,利用多相流湍流模型对潜水自引气曝气机过流部件进行数值模拟,并对模拟结果分析,并进行相关试验验证.结果表明:模拟结果显示曝气机下潜深度从2.5～6.5 m内变化时,模型内部区域的速度矢量分布随着下潜深度的增大从混乱到流畅再到混乱,压力分布图中的低压漩涡从出现到消失再到出现;试验结果表明曝气机下潜深度从2.5～6.5 m变化时,曝气机进气管进气速度先增大后降低,在3.5 m时进气速度最大,达到4.25 m/s;模拟结果与试验测试的曝气机进气性能变化情况趋势一致,证明了根据模拟结果对曝气机性能的预测是可行的.
An open-style impeller with radial blades and an open-type diffuser were designed according to the performance specifications of a submersible self-aspirating aerator to investigate the fluid flow in the aerator, and their three-dimensional models have been generated in CAD code-UG. The turbulent flow through the aerator was simulated by means of CFD software-Ansys-CFX with a multiple-phase tur- bulence flow models, and the simulated results were analyzed and confirmed by related experimental observations. The simulated results showed that when the submersed depth of the aerator was increased to 6, 5 m from 2.5 m, the flow patterns in the aerator experienced three changes, such as chaos, smooth and chaos again, accordingly the lowest pressure zone appeared, disappeared and reappeared as well. The experimental data exhibited that when the submersed depth of the aerator was increased to 6.5 m from 2.5 m, the air in the suction pipe got the highest velocity of 4.25 m/s at the 3.5m sub- mersed depth. A similar air velocity in the suction pipe was achieved too. This suggests that predicting performance of aerator by means of CFD method is feasible.
出处
《排灌机械工程学报》
EI
北大核心
2013年第1期50-55,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
江苏高等学校优秀科技创新团队计划项目(苏教科(2009)10号)
江苏高校优势学科建设工程项目
关键词
潜水自引气曝气机
开放式齿形转轮
数值模拟
性能试验
self-suction type submersible aerator
runnerperformance testradial blades
numerical simulation
