颗粒粒径对海洋采矿扬矿泵固液两相流影响的分析  

Analysis of the Effect of Particle Diameter on Solid-liquid Two-phase Flow in a Lifting Pump of Deep Sea Mining

作　　者：曾义聪[1] 陈奇[1] 谢秋敏[1] 李峰[1] 

机构地区：[1]中南大学机电工程学院,长沙410083

出　　处：《徐州工程学院学报（自然科学版）》2013年第2期46-52,共7页Journal of Xuzhou Institute of Technology(Natural Sciences Edition)

基　　金：国家自然科学基金项目(50975290)

摘　　要：为研究颗粒粒径对扬矿泵固液两相流的影响,采用Mixture多相流模型,对扬矿泵内固液两相流进行叶轮蜗壳耦合数值模拟,并比较不同粒径颗粒对泵内固相体积浓度分布的影响.对扬矿泵输送4种粒径固体颗粒的水力性能进行试验研究,揭示不同粒径颗粒对泵外特性的影响.结果表明:随着固相颗粒粒径增大,叶轮流道内固体颗粒向工作面聚集,颗粒撞击点愈加集中于叶轮工作面,加剧叶轮工作面磨损;蜗壳流道内的颗粒沿基圆向外周壁积聚,愈加集中分布于蜗壳的4～8断面;输送固液两相介质时泵扬程和效率比清水试验工况下低,更易发生汽蚀;在相同流量和浓度的工况下,随着固体颗粒粒径增大,扬程受粒径变化影响较小,最高效率点逐渐下降且出现在相对较小流量处。In order to research the effects of particle diameter on the lifting pump solid-liquid two-phase flow, effects of particle diameter on solid volume concentration distribution were studied with mix-ture model, numerical simulation on solid-liquid two-phase flow in a lifting pump. Experimental research was carried out on the hydraulic performance of lifting pump when delivering four solid particles with dif-ferent diameter, and the effects of particle diameter on pump external characteristics were revealed. The re-suits indicate that, as the particle diameter increases, the solid particles of impeller flow passage will gath-er to the working surface so that the striking point is more concentrated on the surface to increase impeller＇s wearing. And the solid particles in the spiral flow passage accumulate at the peripheral wall a-long the base circle, and concentrate in the volute＇s section 4 to 8. Because of the efficiency of the pump de-livering solid-liquid two-phase media is lower than those when delivering water, the cavitation is easier to happen at condition of mixture media. As the particle diameter increases, the head changes little, the high-est efficiency point gradually decreases and moves to the lower flow and the highest efficiency flow area narrows when delivering solid-liquid two-phase media at same capacity and thickness condition.

关 键 词：扬矿泵 固液两相 颗粒粒径 

分 类 号：TH313[机械工程—机械制造及自动化]