气力疏浚系统临界特性研究  

Study on critical characteristics of airlift dredging system

作　　者：聂时君 胡东 林鹏 王舒 NIE Shijun;HU Dong;LIN Peng;WANG Shu(College of Energy and Mechanical Electrical Engineering,Hunan University of Humanities,Science and Technology,Loudi 417000,China)

机构地区：[1]湖南人文科技学院能源与机电工程学院,湖南娄底417000

出　　处：《武汉大学学报（工学版）》2023年第10期1178-1185,共8页Engineering Journal of Wuhan University

基　　金：湖南省重点研究发展计划项目(编号:2019SK2192,2020NK2063);国家自然科学基金青年项目(编号:52006061);湖南省水利科技项目(编号:XSKJ2019081-56);湖南省教育厅科学研究项目(编号:22B0840);湖南省自然科学基金项目(编号:2023JJ50483)。

摘　　要：以液-固2相临界模型为基础,结合气相含率方程建立了气-液-固3相段临界模型。计算结果表明:3相段内提升固体颗粒对应的临界液体表观流速恒小于2相段,且随临界气量值变化存在一拐点。进一步分析颗粒在水底所受压持力,建立此工况下液-固2相段临界模型,发现静压持效应极不利于颗粒的顺利“启动”。气力疏浚临界试验研究表明:输送液体对应的临界气体表观流速与颗粒尺寸及位置无关,而输送颗粒对应的临界气体表观流速却受此影响极大,由此证实了静压持效应会造成气力提升性能的恶化。A critical model of gas-liquid-solid three-phase flow is proposed based on the critical model of liquidsolid two-phase flow and the gas-phase holdup equation.The results indicate that the critical liquid apparent velocity corresponding to the lifting of solid particles in three-phase flow is always smaller than that in two-phase flow,and there is an inflection point with the change of critical gas volume.By further analyzing the holding force of particles under water,a critical model of liquid-solid two-phase phase is established.It is found that the holding effect of static pressure is not conducive to the smooth"starting"of particles.The critical experiments of airlift dredging show that the critical gas apparent velocity corresponding to the conveying liquid is independent of the size and position of solid particles,but the critical gas apparent velocity corresponding to the conveying solid particle is greatly affected by the location and size,which proves that the static pressure holding effect will cause the deterioration of the airlift performance.

关 键 词：气力疏浚 3相流 临界特性 压持效应 试验研究 

分 类 号：TP69[自动化与计算机技术—控制理论与控制工程]