分流叶片前缘形状对叶片式混输泵性能的影响

Influence of the Front Shape of Splitter Vanes on the Performance of the Vane Type Multiphase Pump

叶片式混输泵在气液工况下极易产生叶顶泄漏涡和气液分离的情况,这会直接导致泵的性能下降,从而影响泵的输送效率致使生产成本增加。针对上述问题,基于CFD仿真对泵的叶轮引入分流叶片进行改型,并探索分流叶片前缘形状对泵性能的影响。研究结果表明:3种分流叶片前缘形状下的模型扬程均高于原模型,其中以曲率连续方案的扬程最大,为10.85 m,扬程和效率相比原模型分别提高31.83%和2.58%;当分流叶片厚度减小时,分流叶片前半部抑制介质分离的能力得到提升,液相在分流叶片吸力面的附着力增强;受带状泄漏涡被抑制的影响,曲率连续方案下叶轮内介质流动紊乱程度低,该抑制量化为叶轮进口液相减阻5.07%和气相减阻3.80%。研究结果可为后续混输泵的优化设计提供参考。

The vane type multiphase pump is prone to produce vane tip leakage vortex and gas-liquid separation under gas-liquid conditions,which directly leads to reduced pump performance,thereby affecting the pump delivery efficiency and increasing the production costs.To solve these problems,based on CFD simulation,the splitter vanes of pump impeller were modified,and the influence of the front shape of splitter vanes on pump performance was investigated.The results show that the models with 3 front shapes of splitter vanes yield higher delivery head than the original model.Typically,the model with continuously curved splitter vane has the highest delivery head of 10.85 m and the efficiency of 33.76%,which are 31.83% and 2.58% respectively higher than the original model.When the thickness of the splitter vanes decreases,the ability of the front half of the splitter vane to suppress medium separation is improved,and the adhesion of the liquid phase on the suction surface of the splitter vane is enhanced.Affected by the suppressed banded leakage vortex,the turbulence degree of medium flow in the impeller is low in case of continuously curved splitter vane,and the suppression is quantified as 5.07% liquid phase drag reduction and 3.80% gas phase drag reduction at the impeller eye.The research results provide reference for the subsequent optimization design of multiphase pumps.