摘要
曝气池内横向水流对气泡的生成过程有明显的影响,曝气对池内流场也有明显影响。为进一步研究曝气池内流场特性,采用声学多普勒流速仪(ADV)对大尺度Orbal曝气池模型内的流场特性进行了实验研究。结果表明:水流经过弯道后流速分布呈现出内侧小、外侧大的特点,且存在横向流速;进入直段后,流速分布不断调整,内、外侧水流流速差减小,且较浅水深时,流速调整较快。开启曝气盘后与清水时相比,曝气盘上游断面,近水面处流速减小,水面下较深处流速增大;曝气盘下游断面,近水面处流速增大,水面下较深处流速减小;曝气盘下游紊动强度明显增强。
The liquid cross-flow has important influence on bubble formation and aeration is important to flow field characteristics in plug-flow aeration tank. A 3D acoustic Doppler velocimeter （ADV） was used to measure the flow field in an aeration tank of large scale and flow field characteristics were analyzed for the further study of flow field characteristics in aeration tank. The results showed that flow velocity distribution had characteristics of medial small and lateral large after the flow passed bend and cross flow existed. After the flow entered straight, the velocity distribution constantly adjusted and difference between medial and lateral water flow velocity de- creased and the deeper shallow water was, the faster flow rate adjusted. Compared with clear water when the aeration plate was open, ve- locity near the surface decreased and that deep below the surface increased at the aeration plate upstream section, but velocity down- stream was opposite. Turbulence intensity after aeration was much larger than that before aeration at the aeration plate downstream sec- tion.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2014年第2期29-35,共7页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(50978173
51109150)
关键词
曝气池
ORBAL氧化沟
声学多普勒流速仪
流场
紊动强度
aeration tank
Orbal oxidation ditch
acoustic Doppler velocimeter
flow field
turbulence intensity
