离心泵流场流固耦合数值模拟

Numerical Calculation on Flow Field in Centrifugal Pump Based on Fluid-structure Interaction Theorem

离心泵叶轮在流场中受到的应力及产生的变形对速度场和压力场有一定的影响。采用双向同步求解方法对离心泵流场和叶轮结构响应进行联合求解,分析叶轮流固耦合作用对其内部流场的影响。对不同工况进行的计算结果表明,叶轮和叶片中应力分布明显不均,局部出现应力集中;叶轮出口后盖板在偏离设计工况时变形较大,影响叶轮出口速度,使蜗壳出现分流的部位向出口移动;导致叶轮出口压力不对称状态、不稳定性更严重;各监测点上压力变化较明显。

The stress and deformation of centrifugal pump impeller have certain impacts on the velocity and pressure fields. A solution for the flow field of centrifugal combined with structure response of impeller was implemented by using two-way coupling method to investigate the effect of FSI of impeller on flow field. By using this method, various flow rate conditions were calculated. The results showed that the stress of the impeller was markedly uneven and the local stress concentration appeared in each operation condition. The back cover board of impeller outlet had large deformation deviating from the design value, which affected the impeller velocity, made the shunt parts in the volute to move export, led to severe unsymmetry phenomena and instability of pressure in impeller outlet. Pressure of every monitoring point changed obviously.