基于FLUENT对SWX型静态混合器的研究分析

通过Pro/E软件进行SWX型静态混合器结构和流体模型的三维建模,并基于ANSYS Workbench下的FLUENT模块进行研究分析,采用标准的κ-ε数学模型对在湍流状态下的静态混合器进行流场、速度场、压力场和传热特性的数值模拟,研究静态混合器内流体的流动特性和混合机理。结果表明:流体沿轴向流动时由于混合单元的存在,使得均为匀速的流体出现了速度的分化,流体的轴向最大流速约为径向流速的1.3倍、周向流速的1.7倍,说明流体受到混合单元的阻扰产生径向和周向运动,使流体不断进行分散、分割和重组等形式的变化,而流体经过第3、4个混合单元后基本达到稳定状态,流速区域的分割也相对稳定;另外,流体流量的高低以及混合单元组的数量直接影响到混合器内压降的大小;最后,通过对比分析证实了静态混合器具有较强的传热特性,为SWX型静态混合器的应用、设计、安装提供了参考依据。

RESEARCH AND ANALYSIS OF SWX STATIC MIXER BASED ON FLUENT

This paper used Pro/E software to perform 3D modeling of the structure and fluid model of the SWX static mixer.Based on the FLUENT module of ANSYS Workbench,the paper made research and analysis.Numerical simulations of flow field,velocity field,pressure field and heat transfer characteristics were carried out to study the fluid flow characteristics and mixing mechanism in static mixers.The results show that due to the existence of the mixing unit,when the fluid flows in the axial direction,the velocity differentiation of uniform fluids occurs.The maximum axial velocity of the fluid is about 1.3 times that of the radial velocity and 1.7 times that of the circumferential velocity.It shows that the fluid is blocked by the mixing unit to produce radial and circumferential movement,which causes the fluid to continue to be dispersed,divided and reorganized.The fluid has basically reached a steady state after passing through the third and fourth mixing units and the segmentation of the velocity region is also relatively stable.In addition,the level of fluid flow and the number of mixing unit groups affect the pressure drop in the mixerdirectly;finally,the comparative analysis confirmed that the static mixer has strong heat transfer characteristics.These provide a reference basis for the application,design and installation of the SWX static mixer.