潜水搅拌器安装角度对盐泥水洗搅拌效果的影响  

Influence of Installation Angle of Submersible Mixer on Salt Water Washing and Mixing Effect

作　　者：朱桂华[1,2] 彭南辉 张傲林 巴赛 唐浩亭 ZHU Guihua;PENG Nanhui;ZHANG Aolin;BA Sai;TANG Haoting(School of Mechanical and Electrical Engineering,Central South University,Changsha 410083,China;State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha 410083,China)

机构地区：[1]中南大学机电工程学院,长沙410083 [2]中南大学高性能复杂制造国家重点实验室,长沙410083

出　　处：《西安交通大学学报》2019年第7期16-22,59,共8页Journal of Xi'an Jiaotong University

基　　金：湖南省科技计划重点资助项目(2014SK2020)

摘　　要：针对传统搅拌桨型无法满足盐泥水洗搅拌的问题,提出了双潜水搅拌式水洗设备,借助Fluent17.0软件,采用MRF法、标准k-ε湍流模型,对该水洗设备中盐泥-水洗剂混合过程进行数值模拟,以流速场、混合时间、单位体积混合能、盐泥体积分数标准差、湍动能以及湍动能耗散率为指标,研究了搅拌叶轮转速为480 r/min时,水洗设备内双潜水搅拌器以不同安装角度下的混合特性,并通过实验验证模拟仿真的有效性。研究结果表明:各安装角度下的搅拌流速场不具对称性,近潜水搅拌器的流体区域流动较为紊乱,安装角度α为20°时,整个流体域内低流速区占比小,远离搅拌器的下游处流速较高且分布均匀,两相混合时间和混合时间数最小,混合均匀度最佳,适用于快速式搅拌模式;α为40°时,湍动能耗散率最小,单位体积混合能最小,可达到最佳的节能效果,适用于持久式搅拌模式。实验结果表明数值模拟结论有效,可为盐泥的高效水洗处理提供一定的参考。Aiming at the problem that the traditional mixing paddle cannot meet the requirements of salt water washing and stirring,a double submersible stirring-type washing equipment is proposed.With the Fluent17.0,the MRF method and standard k-ε turbulence model are used to mix the salt mud-water lotion in the washing equipment.The numerical simulation was conducted in the process.The velocity field,mixing time,mixing energy per unit volume,standard deviation of salt mud volume fraction,turbulent kinetic energy and the turbulent energy dissipation rate were used to study the stirring speed of the stirring impeller at 480 r/min.The mixing characteristics of the double submersible mixer at different installation angles were studied and the experimental results verified the effectiveness of the simulation.It is shown that the agitation flow field under each installation angle is not symmetrical,and the fluid flow in the submersible agitator is relatively disorderly.When the installation angle is 20°,the proportion of low flow area in the whole fluid domain is small;the flow rate is relatively high and evenly distributed away from the downstream of the agitator;the mixing time and dimensionless mixing time of the two phases are the shortest;and the mixing uniformity is the best in the fast mixing mode.When the angle is 40°,the turbulent energy dissipation rate and the mixing energy per unit volume are the smallest,which can achieve the best energy saving,suitable for persistent stirring mode.The experimental result shows that the numerical simulation conclusion is effective and can provide reference for the efficient washing treatment of salt mud.

关 键 词：双潜水搅拌式水洗设备 流速场 混合特性 安装角度 

分 类 号：X705[环境科学与工程—环境工程]