摘要
为分析固相浓度对深海采矿矿浆泵空化特性的影响,通过空化核子理论、质能方程建立气相和液相、固相和液相之间的联系,探求气固两相之间的理论关系,进行固相参数对深海采矿矿浆泵空化性能影响分析,并采用mixture多相流模型,RNG k-ε湍流模型,Schnerr and Sauer空化模型,在fluent软件中对矿浆泵进行稳态空化仿真。比较不同颗粒浓度对矿浆泵流场压力分布、气相分布及工作性能的影响,为矿浆泵空化特性提供依据。研究结果表明:空化发生时的临界气泡半径与固相浓度及其流量可通过液体压强建立联系,固相颗粒浓度越大、固相流量越大,空化将提前发生,抗空化性能将下降;随着固相浓度的增加,在矿浆泵首级叶轮叶片背面入口处压力降幅增大,气相体积分数增大,泵扬程减小,汽蚀余量减小。
In order to analyze the influence of solid concentration on the cavitation characteristics of deep-sea mining pump, the relationship between gas phase and liquid phase, solid phase and liquid phase are established through the theory of cavitation nucleus and the energy equation. And the effect of solid-phase parameters on the cavitation performance of deep-sea mining pump is studied. The cavitation steady simulation of slurry pump is carried out by fluent software using the mixture multiphase flow model, RNG k-ε turbulence model and Singhal fully cavitated model. The influence of different particle concentration on the pressure distribution, gas distribution and working performance of the slurry pump are given, which provides the theoretical basis for the cavitation characteristics of the slurry pump. The results show that the critical bubble radius and the solid concentration and the flow rate can be established by the liquid pressure when the cavitation occurs. The larger the solid phase particle concentration is, the larger the solid phase flow will occur. The anti-cavitation performance of pump will decrease. With the increase of solid concentration, the pressure decreases at the inlet of the impeller blade of the primary pump, as well as the volume fraction of the gas and the anti-cavitation performance.
作者
徐海良
徐聪
曾义聪
吴波
XU Hailiang;XU Cong;ZENG Yicong;WU Bo(School of Mechanical and Electrical Engineering, Central South University, Changsha 410083;State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2019年第8期201-207,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51775561)
湖南省自然科学基金资助项目
深海采矿阀控式清水泵水力提升设备工作机理及设计方法(2018JJ2522)
关键词
深海采矿矿浆泵
空化特性
固相浓度
理论分析
数值模拟
deep sea mining pump: cavitation
solid-phase concentration
theoretical analysis
numerical simulation
