李双喜,宋子锋,杨兴,芦建平,黄承尧
LI Shuangxi,SONG Zifeng,YANG Xing,LU Jianping,HUANG Chengyao

• 1:北京化工大学机电工程学院
• 2:唐山盈和瑞环保设备有限公司
• 3:北京盈和瑞环境科技有限公司

摘要(Abstract)：

针对射流搅拌系统搅拌效果与工艺参数关系尚不明确的问题，基于VOF两相流模型及SST k-omega湍流模型，建立了三维瞬态模型。引用死区比率、液相速度均方根、自由液面液相体积分数均方根为表征液相搅拌效果及破壳效果的特征参数；搭建原理性试验装置，验证了数值模拟结果的准确性。结果表明，由于喷嘴距离自由液面较近，流场波动，罐内产生负压区导致罐体安全问题，建议喷嘴远离自由液面；结合搅拌效果及工程成本，当入口速度V_(in)=20 m/s时，搅拌收益率最高；含气比与搅拌效果呈负相关，与破壳效果呈正相关，含气比a=0.621为较优含气比。通过对三维瞬态流场模拟，分析流场流动特点，得到了工艺参数对搅拌效果的影响规律，进一步指导工艺参数选择。
In order to clarify the problem of still unclear relationship between mixing effect and process parameters,based on the VOF two-phase flow model and SST k-omega turbulence model,a three-dimensional transient model was established. The characteristic parameters such as dead zone ratio,root mean square of liquid velocity and root mean square of liquid volume fraction on the free surface were calculated to characterize the effect of liquid mixing and shell breaking. A principle test device was built to verify the accuracy of the numerical simulation results. The research results indicate that the closer distance of the nozzle to the free surface causes fluctuation of flow field,and negative pressure zone is generated in the tank,which leads to tank safety problems. So it is suggested that the nozzle should be far away from the free surface. In combination with the mixing effect and engineering cost,when the inlet velocity Vin=20 m/s,the mixing yield is the highest. The air content ratio is negatively correlated with mixing effect and positively correlated with the shell breaking effect. The better air content ratio is a=0.621. By simulating the three-dimensional transient flow field and analyzing the flow characteristics of the flow field,the influence of process parameters on the mixing effect was obtained,which further guides the selection of process parameters.

关键词(KeyWords)： 射流搅拌;气液两相流;数值模拟;计算流体力学;动态仿真
jet mixing;gas-liquid flow;numerical simulation;CFD;dynamic simulation

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划项目（2018YFB2000800）

作者(Author): 李双喜,宋子锋,杨兴,芦建平,黄承尧
LI Shuangxi,SONG Zifeng,YANG Xing,LU Jianping,HUANG Chengyao

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