摘要
固-液两相输送系统中由于输送介质中含有大量硬质颗粒,在运行过程中泵的过流部件材料磨损严重,导致泵扬程和效率偏低,从而危害整个输送系统的运行安全。该文基于计算流体力学(Computational Fluid Dynamics,CFD)与离散单元法(Discrete Element Method,DEM)相耦合的方法,并考虑了颗粒对湍流调制的影响,通过与已有实验结果对比,验证了该计算模型的准确性。研究了固体颗粒浓度对泵性能和磨损的影响。结果表明,小浓度颗粒的加入减弱了泵内湍动能,泵内流动更稳定,扬程和效率提高;大浓度工况下,泵内颗粒团聚现象严重,泵内湍动能增大,导致泵扬程和效率降低;颗粒与叶片头部和叶片工作面碰撞频繁,叶轮叶片磨损主要位于叶片头部和叶片工作面,颗粒在蜗壳隔舌处聚集,隔舌处磨损最严重。
Pumps used for conveying liquid-solid two phase flows usually suffer from severe wear,because the conveying medium contains a large amount of coarse and hard particle.The wears on hydraulic parts of the pumps cause low pump head and efficiency,and eventually jeopardizing the whole conveying system.Based on the coupled method of Computational Fluid Dynamics(CFD)and Discrete Element Method(DEM),the particle turbulence modulation model is customized in the CFD-DEM model,and the influence of particles on turbulence modulation is considered.The accuracy of the model is verified by comparing with the previous experimental results,and the effect of particle characteristics on the external characteristics of the pump is studied.The results show that the turbulent kinetic energy of the pump is weakened in low concentration,the flow is more stable,and the head and efficiency are improved.Under the high concentration condition,particle agglomeration is serious,and the turbulent kinetic energy is increased,which leads to the reduction of the head and efficiency of the pump.The collision between particles and blade head and blade working face is frequent,the erosion of impeller is mainly located on the blade head and working surface,the particles gather at the volute tongue,the most serious erosion is at the tongue.
作者
赵睿杰
李静
赵有龙
张德胜
高雄发
ZHAO Rui-jie;LI Jing;ZHAO You-long;ZHANG De-sheng;GAO Xiong-fa(Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,China)
出处
《水动力学研究与进展（A辑）》
CSCD
北大核心
2021年第5期640-647,共8页
Chinese Journal of Hydrodynamics
基金
国家重点研发计划(2017YFC0404203)
中国博士后科学基金(2020M672121)
山东省重点研划(2019TSLH0304)。
关键词
离心泵
固液两相流
CFD-DEM
性能
磨损
Centrifugal pump
solid-liquid two-phase flow
CFD-DEM
efficiency
erosion
