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工程科学与技术:2014,46(2):29-35
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基于ADV的推流式曝气池流场特性研究
(1.四川大学 水力学与山区河流开发保护国家重点实验室;2.华能澜沧江水电有限公司)
Study of Flow Field Characteristics in Plug-flow Aeration Tank Based on ADV
(1.State Key Lab. of Hydraulics and Mountain River Eng.,Sichuan Univ.;2.Huaneng Lancang River Hydropower Co. Ltd)
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投稿时间:2013-08-27    修订日期:2013-11-17
中文摘要: 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。
Abstract: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 decreased and the deeper shallow water was,the faster flow rate adjusted.Compared with clear water when the aeration plate was open,velocity near the surface decreased and that deep below the surface increased at the aeration plate upstream section,but velocity downstream was opposite. Turbulence intensity after aeration was much larger than that before aeration at the aeration plate downstream section.
文章编号:201300967     中图分类号:    文献标志码:
基金项目:国家自然科学基金资助项目(50978173;51109150)
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引用文本:
张亚磊,张法星,张敬威,郑秋文.基于ADV的推流式曝气池流场特性研究[J].工程科学与技术,2014,46(2):29-35.
Zhang Yalei,Zhang Faxing,Zhang Jingwei,Zheng Qiuwen.Study of Flow Field Characteristics in Plug-flow Aeration Tank Based on ADV[J].Advanced Engineering Sciences,2014,46(2):29-35.