基于双向耦合的吸沙泵外壳与叶片摩损仿真分析

Simulation Analysis of Friction Loss of Pump Suction Sand Shell and Blade Based on Two-Way Coupling

为研究吸沙泵磨损机理,建立吸沙泵的三维几何模型和两相流模型,通过仿真与试验数据的对比验证模型的准确性。分别采用单向和双向流固耦合方法对建立的固液两相流模型进行数值模拟,并对叶片及壳体相关区域的速度和压力分布进行分析。结果表明:固相粒子普遍集中在泵体内缘,出口处固相分布多于进口处;与单向耦合相比,双向耦合更符合实际情况;摩擦磨损主要集中于泵体内缘和叶片的工作面沿半径方向外侧;粒径越大,固相分离现象越明显,增加转速使扬程降低,但是转速过低会使效率急剧下降。

In order to study the mechanism of the sand suction pump wear, the three-dimensional geometric model and two-phase flow model of the sand suction pump is established and the accuracy of the models through the comparison of simulation data and experimental data is verified. The unidirectional and bidirectional fluid- solid coupling methods are adopted respectively to make the numerical simulation of the established solid-liquid two-phase flow model, the velocity and pressure distribution of the relevant area of the blade and shell is analyzed. The results show as follows. The solid phase particles are generally focused on the inner edge of the pump body, more solid phase distribution at the exit than that at the inlet. Compared with the one-way coupling, the two-way coupling is more in line with the actual situation. The friction and wear are mainly concentrated on the inner edge of the pump body and the blade working face along the radius direction of the lateral. The bigger the particle is, the more obvious the solid phase separation phenomenon is. The rotating speed increase lowers the head, but the low speed drops sharply in efficiency.