固体颗粒对应急排水车排水泵性能的影响

Impacts of solid particles on drainage pump performances of emergency drainage vehicles

以应急排水车用排水泵为研究对象,采用数值仿真方法,研究排水泵固液两相流动特征,分析固体颗粒对水泵的磨损及外特征性能参数影响的规律,提出了有利于流动的模型优化措施.结果表明:叶轮进口后盖板附近区域、正导叶的凹面以及叶轮叶片进口附近区域的磨损较大;随着固体颗粒直径的增大,扬程和效率减小而功率增大,但变化幅度很小,随着固体颗粒体积含量的增大,其变化趋势相同但变化幅度较大;通过分析首级叶轮内部流场的不规律流动现象,得到了改善流动状态的方法.

Pertaining to the drainage pump performances of emergency drainage vehicles, the flow properties of solid-liquid two phases are speculated using numerical simulation. By analyzing the impacts of solid particles upon pump wear and external performance parameter, the model optimization metrics are postulated for good fluidity. Therefore, it is found from results that the wears are relatively larger near such areas as back cover, guide vane concave, impeller blade entrance. When the solid particle diameter increases, the variations are relatively smaller with throw and efficiency deceasing and power increasing. When the solid particle volume content increases, the analysis on the irregular internal flow field of the first variation increases with the same tendency. With stage impeller, the fluidity is improved.