基于拉瓦尔管的气液两相流雾化规律研究  

Study of atomization law of gas-liquid two-phase flow based on Laval tube

作　　者：刘承婷[1,2] 贺亮 管恩东 LIU Chengting;HE Liang;GUAN Endong(School of Petroleum Engineering, Northeast Petroleum University, Daqing 163318, China;Key Laboratory of Enhanced Oil Recovery (Northeast Petroleum University), Ministry of Education, Daqing 163318, China;Gaosheng Oil Production Plant, Liaohe Oilfield Company, Panjin 124099, China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]提高油气采收率教育部重点实验室(东北石油大学),黑龙江大庆163318 [3]辽河油田公司高升采油厂,辽宁盘锦124099

出　　处：《大连理工大学学报》2022年第2期179-187,共9页Journal of Dalian University of Technology

基　　金：中国石油科技创新基金资助项目(2019D-5007-0206).

摘　　要：基于拉瓦尔管设计了一种雾化喷管,使天然气产生超音速流动,把液流剪切破碎成小液滴,降低了气液相截面密度和流动阻力.采用数值仿真软件Fluent模拟了喷管内部气液相流动的微观形态和内部流场规律,分析了气相压力、液流速度、喷孔直径和液相喷孔数量对雾化颗粒分布规律和雾化效果的影响.研究得出在303975 Pa的气相压力下液流喷射深度为0.9112 mm,散射宽度为1.2013 mm,雾化效果较好;气相压力增大至1013250 Pa时,雾化颗粒贴近壁面,喷射深度为0.3041 mm,散射宽度为0.3650 mm,雾化效果变差.液流速度增加,雾化效果增强;喷孔直径增大,喷射深度增加,喷孔直径为1.2 mm时,散射宽度有极大值2.3562 mm,雾化效果最好.使用双喷孔结构,雾化颗粒直径分布均匀,近似于正态分布,雾化颗粒直径减小,雾化效果增强.通过改变工况参数,可提高携液率和排采质量.An atomizing nozzle is designed based on Laval tube,which makes the natural gas flow at supersonic speed,shears and breaks the liquid flow into small droplets,and reduces the cross-sectional density and flow resistance of the gas and liquid phases.The microscopic shape and internal flow field law of gas-liquid flow inside the nozzle are simulated with Fluent numerical simulation software.The influence of gas phase pressure,liquid flow velocity,orifice diameter and number of liquid orifices on atomized particle distribution law and atomization effect is analyzed.The research shows that the liquid jet depth is 0.9112 mm and the scattering width is 1.2013 mm under the gas phase pressure of 303975 Pa,the atomization effect is better.When the gas phase pressure is increased to 1013250 Pa,the atomized particles are close to the wall,the jet depth is 0.3041 mm,the scattering width is 0.3650 mm,and the atomization effect is deteriorated.When the liquid flow velocity is increased,the atomization effect is enhanced;the orifice diameter is increased,the spray depth increases.When the orifice diameter is 1.2 mm,the scattering width has a maximum value of 2.3562 mm,and the atomization effect is the best.The double orifice structure is used,the atomized particle diameter distribution is uniform and close to normal distribution,the atomized particle diameter is reduced,and the atomization effect is enhanced.By changing the working condition parameters,the liquid carrying rate and drainage quality can be improved.

关 键 词：雾化喷管 气液两相流 超音速流动 喷射深度 散射宽度 雾化效果 

分 类 号：TE377[石油与天然气工程—油气田开发工程]