稠密细颗粒浓度对固液两相离心泵内部流动与外特性的影响

The problem that pressure loss increases, efficiency decreases and energy consumption increases are rather serious when the dense fine particles solid liquid two phase fluids are transported using centrifugal pump.Therefore, it is urgent to carry out the study on effect of the concentration of dense fine particles on the performance of the solid liquid two phase centrifugal pump.. In this project, the centrifugal pump are choice as the research object, and the research method including theoretical analysis, numerical simulation and experimental study are adopt. the suitable solid-liquid two phase flow containing dense fine particles are established accurately, and the numerical simulation on internal flow field are carried out, the effect of concentration of dense fine particles on the the flow field in the centrifugal pump are researched, and the law of mixture phase flow in the pump are put forward, the relationship between concentration of solid particles and internal flow characteristics and external characteristics are build, the quantitative prediction of the internal characteristics and exterior performances of the dense fine particles solid-liquid centrifugal pump are realized, and the wear position of the centrifugal pump are accurately predict. The work will provided the theoretical support for the optimal design and application of a high performance centrifugal pump for conveying dense fine particles- liquid mixture fluid.

离心泵在输送稠密细颗粒固液两相流介质时压力损失增加、效率低、能耗高的问题更加突出。因而亟需开展稠密细颗粒浓度对固液两相离心泵性能的影响。. 本项目拟以叶片式离心泵为研究对象，通过理论分析、数值模拟和内外特性实验研究， 建立准确描述稠密细颗粒固液两相流动的理论模型，开展稠密细颗粒固液两相离心泵内部流动数值计算，研究稠密细颗粒浓度对离心泵内部流场特性的影响，揭示稠密细颗粒固液两相流在离心泵内的流动机理，建立固相浓度与内部流动特性和外特性之间的关联函数，实现稠密细颗粒固液两相离心泵内外特性的定量预测，并准确预估离心泵内的磨损位置，为稠密细颗粒液固两相离心泵的设计和优化运行提供理论支撑。

目前，国内外对固液两相离心泵的研究在实验、数值和理论分析等方面已开展了大量的研究工作，并取得了一定的研究进展。但多数是针对固相颗粒浓度较低的工况，而在实际应用中，随着各种资源开发的深入，固液两相离心泵输送的介质当中固相颗粒粒度较小，且浓度较大的工况条件越来越受到关注，但相关研究尤其是其在离心泵内部流动的相关基础理论研究却很少。本项目针对高浓度、细颗粒固液两相离心泵泵内部的两相流动问题，采用理论研究、数值仿真和实验相结合的方法，明确了稠密细颗粒固液两相流模型，在此基础上，采用理论和实验相结合的方法，进一步研究了颗粒的浓度、尺寸对离心泵内部流动特性，外特性和磨损性能的影响，揭示了离心泵内部稠密细颗粒固液两相的流动规律，并通过正交实验回归分析的方法研究颗粒浓度、尺寸、工况条件与离心泵叶轮磨损特性和外特性和的实验关联式，同时，通过数值计算和磨损实验考察了不同材料特性，叶片包角的几何结构对离心泵内外特性的影响，为实现了离心泵叶轮磨损性能以及扬程、效率的定量预测提供了研究基础，也为稠密细颗粒液固两相流输送泵的设计和优化运行提供理论支撑。