CAJ | 학술논문

为获得旋流泵内更为符合物理真实的液固两相流动特征，在传统欧拉（Euler）双流体模型基础上加载群体平衡模型（PBM），以考虑实际存在的颗粒聚并、破碎等动力学行为，与CFD耦合计算了不同流量、颗粒粒径及浓度下的液固两相流场，分析了颗粒存在对泵外特性的影响规律。计算结果表明：从进口到出口，叶片背面附近颗粒粒径明显增大；在叶轮出口位置，同一半径上，从叶片工作面到背面附近存在粒径梯度；在外缘部，沿轴向形成粒径梯度。与Euler模型计算结果对比发现：加载PBM模型后，颗粒总体浓度分布特征存在差异；同一轴截面上，颗粒浓度在中心部的分布基本相同，而在中间和外缘部位置出现差异。PBM模型计算得到的泵扬程、效率曲线更接近于实验值，证明基于CFD-PBM耦合计算的预测精度更符合实际。
위획득선류빙내경위부합물리진실적액고량상류동특정，재전통구랍（Euler）쌍류체모형기출상가재군체평형모형（PBM），이고필실제존재적과립취병、파쇄등동역학행위，여CFD우합계산료불동류량、과립립경급농도하적액고량상류장，분석료과립존재대빙외특성적영향규률。계산결과표명：종진구도출구，협편배면부근과립립경명현증대；재협륜출구위치，동일반경상，종협편공작면도배면부근존재립경제도；재외연부，연축향형성립경제도。여Euler모형계산결과대비발현：가재PBM모형후，과립총체농도분포특정존재차이；동일축절면상，과립농도재중심부적분포기본상동，이재중간화외연부위치출현차이。PBM모형계산득도적빙양정、효솔곡선경접근우실험치，증명기우CFD-PBM우합계산적예측정도경부합실제。
In order to obtain physical reality of liquid-solid two-phase flow characteristics in a vortex pump,ased on the Euler-Euler two fluid model,loading population balance model (PBM).Considering particle dynamics behavior of coalescence and breakage,calculating liquid-solid two-phase flow field under different flow rate,particle size and volume concentration of particles, and pump performance variation with particles.Calculation results show that:From import to export,particle size near the back of the blade increases significantly;in impeller exit location,the same radius,from the blade to near the back form reverse diameter gradient;in the outer section,forming reverse diameter gradient in the direction of axial.Comparing with Euler-Euler two fluid model results,after loading PBM model,the total particle concentration distribution characteristic exist differences;in the same shaft section,the distribution of particle concentration is basically the same in the center;but in the middle and out edge location appear difference.PBM model to calculate the pump head and efficiency is more closer to the experimental value,proving that CFD-PBM coupled calculation of prediction accuracy is higher.