排灌机械工程学报2018，Vol.36Issue(2)：104-110,7.DOI:10.3969/j.issn.1674-8530.16.0101
叶片形状对倒伞曝气机性能的影响
Influence of blade shape on performance in inverse umbrella aerator
摘要
Abstract
In order to study the effect of radial straight blade and leaned blade on the performance of inverse umbrella aerator and obtain the flow characteristic of an oxidation ditch driven by two inverse umbrella aerators with different kinds of blade shape,a lab scale oxidation ditch according with geometric similarity,kinematic similarity and dynamic similarity was taken as the research object.The volume of fluid (VOF) model was adopted and the standard k-ε turbulence model was applied to close the governing equations.Through changing the blade shape of inverse umbrella aerator,three-dimensional numerical simulations were conducted.The results show that the power assumption of these two kinds of inverse umbrella aerators is much the same,the blade shape has a significant impact on oxygenation capacity and plug-flow capacity on the inverse umbrella aerator.Under the drive of inverse umbrella aerator with radial straight blade,the gas volume fraction of the section crossing the driving shaft in the oxidation ditch is 0.66％ higher than that in the oxidation ditch driven by the inverse umbrella aerator with leaned blade.While the inverse umbrella aerator with radial straight blade has a stronger ability to promote the fluid near the surface,the inverse umbrella aerator with leaned blade does better on driving fluid at the bottom of the ditch,with the dead water zone 0.70％ less than that in the ditch driven by the inverse umbrella aerator with radial straight blade.The fluid stirred by the inverse umbrella aerator with leaned blade flows to the wall at a higher speed.The flow distribution of the oxidation ditch driven by two inverse umbrella aerators is symmetrical.The downstream inverse umbrella aerator has an ability to lift and accelerate the incoming flow.关键词
倒伞曝气机/氧化沟/叶片形状/VOF/数值模拟Key words
inverse umbrella aerator/oxidation ditch/blade shape/VOF/numerical simulation分类
资源环境引用本文复制引用
明加意,董亮,刘厚林,赵宇琪,姚瀚..叶片形状对倒伞曝气机性能的影响[J].排灌机械工程学报,2018,36(2):104-110,7.基金项目
国家自然科学基金资助项目(51309119) （51309119）
浙江省重大科技专项重大工业项目(2014C01004-1) （2014C01004-1）
过程装备与控制工程四川省高校重点实验室开放基金资助项目(GK201403) （GK201403）
江苏省产学研前瞻性联合研究项目(BY2016072-01) （BY2016072-01）
江苏高校优势学科建设工程资助项目 （）
