潜水搅拌器叶片安放角的性能  

Performance analysis of blade angle of submersible agitator

作　　者：任向轩 汤方平[2] 徐莹 石丽建 尚晓君 REN Xiangxuan;TANG Fangping;XU Ying;SHI Lijian;SHANG Xiaojun(School of Electricity,Energy and Power Engineering,Yangzhou University,Yangzhou 225009,China;School of Water Conservancy Science and Engineering,Yangzhou University,Yangzhou 225009,China;Taihu Lake District Water Conservancy Management Office,Suzhou 215128,China)

机构地区：[1]扬州大学电气与能源动力工程学院,江苏扬州225009 [2]扬州大学水利科学与工程学院,江苏扬州225009 [3]江苏省太湖地区水利工程管理处,江苏苏州215128

出　　处：《南水北调与水利科技（中英文）》2021年第4期805-813,共9页South-to-North Water Transfers and Water Science & Technology

基　　金：江苏省自然科学基金(BK20190914);中国博士后科学基金(2019M661946);江苏省高校自然科学研究项目(19KJB570002);扬州市自然科学基金(YZ2018103);江苏省高校优势学科建设项目(PAPD)。

摘　　要：为研究潜水搅拌器在不同的叶片安放角度(-4°、-2°、0°、2°、4°)下对搅拌池内流场影响的差异,现分别对不同叶片安放角下的潜水搅拌器进行数值模拟并利用CFD后处理软件对所得的流场分析处理。根据数值模拟结果得出:在不同的叶片安放角下,潜水搅拌器流场的速度矢量图总体变化趋势一致且叶片安放角由-4°增大到4°,潜水搅拌器的搅拌效果越来越好;同时随着叶片安放角的增加,潜水搅拌器的轴功率、推力在不断地增大,叶片压力面的高压区也在逐渐地增大;相对于搅拌效果而言,在小转速下可以通过增大叶片安放角来增加潜水搅拌器的搅拌效果,在大转速下可以通过减小叶片安放角来控制潜水搅拌器的搅拌效果,以此达到有效节能的目的;为证明潜水搅拌器数值模拟结果的准确性,选取叶片安放角为0°时的情况进行了试验验证,为以后潜水搅拌器的研究提供一定的参考。Submersible agitator,also known as submersible propeller,is widely used in the sewage treatment plant process.Recently,the use of CFD software is used to simulate the flow field changes in the stirred tank,more clearly provides us with theoretical support.It is the emergence of this numerical simulation technology that the research of submersible agitators has entered a new stage.Therefore,researchers from the design parameters of the submersible mixer,installation position,speed adjustment,and other aspects,to not only improve the mixing effect of the submersible mixer,but also achieve the purpose of effective energy saving.Up to now,the installation scheme of submersible agitators has been studied more or less.However,how the blade angle of the submersible agitator affects the flow field has not been studied.Therefore,based on the previous research,the influence of blade angle on the performance of submersible agitators is simulated.The change of impeller blade setting angle is realized by rotating the corresponding angle around the y-axis in turbogrid.The y-axis rotates 2°in the positive direction(clockwise),that is,the blade setting angle is adjusted to-2°(clockwise is negative,counterclockwise is positive),and so on.The purpose is to study the flow characteristics in the stirred tank with different blade placement angles(-4°,-2°,0°,2°and 4°),to provide a reference for selecting the appropriate blade placement angle according to the mixing requirements and energy-saving effect.To study the influence of different blade angles(-4°,-2°,0°,2°and 4°)on the flow field in the stirred tank,the numerical simulation of the submerged agitator with different blade angles is carried out,and the flow field is analyzed by CFD-Post software.According to the results of numerical simulation,it is concluded that:(1)The velocity field in the mixing tank is axisymmetric concerning the submersible agitator.The flow is pushed forward along the center of the submersible agitator.When the central jet moves to the other si

关 键 词：潜水搅拌器 叶片安放角 数值模拟 轴向流速 

分 类 号：X703.3[环境科学与工程—环境工程]