旋流对二氧化碳超声速凝结特性的影响  

Effects of Swirl on Supersonic Condensation Characteristics of CO_(2)

作　　者：陈佳男 蒋文明[1] 刘杨[1] 曹学文[1] CHEN Jia’nan;JIANG Wenming;LIU Yang;CAO Xuewen(College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266580

出　　处：《石油学报（石油加工）》2022年第1期119-127,共9页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(51904326,51406240);山东省自然科学基金项目(ZR2019MEE105,ZR2019MEE011);青岛市科技计划项目(19-6-1-87-nsh)资助。

摘　　要：为了研究旋流对超声速喷管中CO_(2)凝结特性的影响,基于气-液两相流动控制方程、凝结模型和CO_(2)表面张力模型,建立了CO_(2)-CH_(4)二元混合气体旋流凝结流动的数学模型,模拟了CO_(2)在超声速喷管中的旋流凝结过程。数值结果表明:在旋流流动过程中,CO_(2)凝结成核过程中释放大量潜热传递给周围介质,使过冷度迅速下降,气体重新达到平衡状态,此时气体过冷度依然大于0,为液滴的生长创造了良好的环境。强旋流和壁面边界层的存在导致凝结参数沿喷管径向分布不均匀,并且增加旋流强度会增大液滴碰撞几率和喷管液化效率,但旋流强度增大同样会限制气体膨胀特性和喷管过流能力。Here,a mathematical model for the swirling condensation flow of CO_(2)-CH_(4) binary mixed gas was established based on the gas-liquid two-phase flow control equation,condensation model and CO_(2) surface tension model,and the swirling condensation process of CO_(2) in supersonic nozzle was simulated.The numerical results show that in the swirling flow process,the condensation nucleation process of CO_(2) releases a lot of latent heat to the surrounding media,the undercooling degree drops rapidly,and the gas reaches the state of equilibrium again.After nucleation,the gas undercooling is still greater than 0,which creates a good environment for droplet growth.The existence of strong swirl and wall boundary layer results in the non-uniform distribution of condensation parameters along the nozzle’s radial direction,and the increase of swirl intensity increases the probability of droplet collision and the liquefaction efficiency of the nozzle.However,the increase of swirl intensity also limits the gas expansion characteristics and the nozzle’s flow capacity.

关 键 词：天然气脱碳 超声速喷管 超声速旋流凝结特性 数学模拟 二元混合物 

分 类 号：TE868[石油与天然气工程—油气储运工程]