CAJ | 학술논문

利用CFD软件模拟的方法研究鼓泡塔内气液两相流动力特性，为鼓泡塔的设计提供依据。采用欧拉－欧拉双流体模型分别结合标准k －ε紊流模型和RNG k －ε紊流模型对鼓泡塔内气液两相流进行数值模拟，并使用Phase Coupled SIMPLE算法进行速度与压力耦合求解。比较鼓泡塔内轴截面（ y ＝0）处不同高度液相速度和气相速度的变化情况，发现速度沿径向呈现出抛物线分布，沿水深方向越接近通气孔，速度越大，且气相速度整体大于液相速度。通过将z ＝0．28 m处的垂向液相速度与实验值比较，得出欧拉－欧拉双流体模型结合标准k－ε紊流模型模拟鼓泡塔气液两相流动力特性优于RNG k －ε模型，且发现上升力对模拟结果有显著的影响。
이용CFD연건모의적방법연구고포탑내기액량상류동력특성，위고포탑적설계제공의거。채용구랍－구랍쌍류체모형분별결합표준k －ε문류모형화RNG k －ε문류모형대고포탑내기액량상류진행수치모의，병사용Phase Coupled SIMPLE산법진행속도여압력우합구해。비교고포탑내축절면（ y ＝0）처불동고도액상속도화기상속도적변화정황，발현속도연경향정현출포물선분포，연수심방향월접근통기공，속도월대，차기상속도정체대우액상속도。통과장z ＝0．28 m처적수향액상속도여실험치비교，득출구랍－구랍쌍류체모형결합표준k－ε문류모형모의고포탑기액량상류동력특성우우RNG k －ε모형，차발현상승력대모의결과유현저적영향。
In order to provide a basis for the design of bubble columns , the paper studied two-phase flow dynamic characteristic in a bubble column by using the CFD software .It used Euler-Euler two-fluid model along with standard k -εturbulence model and RNG k -εturbulence model to simulate the gas-liquid two-phase in the bubble column , and took the Phase Coupled SIMPLE algorithm to solve velocity and pressure .The comparisons of velocities of gas and liquid at different heights in the middle section ( y =0) of the bubble column show that the velocity distribution in the radial direction is parabolic , and the closer the position is to the vent along the depth direction , the greater the velocity is ,and the vertical ve-locity of gas phase is greater than that of liquid phase .By comparing the vertical liquid velocities with ex-perimental values at the height of z=0.28m, it obtained that the Euler-Euler two-fluid model combined with standard k -εturbulent two-phase flow model is better than RNG k -εmodel in simulating the dy-namic characteristics of bubble columns , and the lift force has significant impact on simulation result .