离心泵气液固多相流动数值模拟与试验

为研究离心泵输送含有气固液多相时内部的流动情况,采用Pro/E三维造型软件进行几何造型,基于ANSYSCFX软件应用雷诺时均方程、双方程湍流模型,并结合SIMPLEC算法对其内部三维气固液多相流各相流动规律进行数值计算,将计算结果与试验结果进行对比结果表明:受气相所产生旋涡的影响,固相体积分数在径向量纲位置r/R2为0.4时达到最大值后直线急剧下降,下降至一定值后开始波动变化,而气相体积分数在径向量纲位置r/R2为0.4时较小,从径向量纲位置r/R2为0.4以后急剧增大。气、固两相互相影响对方颗粒的分布。气相主要集中在叶片工作面的中间位置,气相的存在使叶轮流道内产生旋涡,影响叶轮流道内的能量交换与传递;固相在没有旋涡的流道内是紧靠叶片表面运动的,在有旋涡流道内主要是随着旋涡旋转方向进行流动,固相所占比值的增加对流动轨迹的影响并不明显。对气液固多相流的深入研究和应用提供了有价值的参考。

Numerical simulation and experiment on gas-liquid-solid multiphase flow in centrifugal pump

In order to study the internal solid-liquid-gas flow of centrifugal pump, Pro/E 3D modeling software was used to make geometric modeling. Based on the application of Reynolds time-average equations, two-equation turbulence model and SIMPLEC algorithm, numerical simulation were involved in studying the flow rules of the solid-liquid-gas flow media in the centrifugal pump. Comparing the calculation results, the solid volume fraction reached the maximum at 0.4 of r/R2, then sharply declined in a straight line, and were fluctuating at certain point; the gas volume fraction was small at 0.2~0.4 of r/R2, and increased sharply after 0.4 of r/R2. Solid and gas phase concentration influenced each other in the particle size distribution. The gas phase mainly gathered in the middle of the blade, which made the vortex appear in the impeller passageway. The energy exchange and transmission in the passageway were influenced the emerging vortex. Without vortex in the passageway, the solid phase moved along the surface of the impeller; and with vortex, it moved with the rotation of the vortex. The flow track was rarely influenced with the increasing of solid phase concentration increases. The research provides a reference for the further research and application of gas-liquid-solid multiphase flow.