多联机旋风式油气分离器内管与进气碰撞的数值模拟  

Numerical simulation of cyclone oil-gas separator's inner pipe and inlet-collision in VRF system

作　　者：罗毅[1,2] 孟建军[2,3] 晏刚[1] 冯健美[1] 

机构地区：[1]西安交通大学 [2]青岛海信日立空调系统有限公司 [3]上海理工大学

出　　处：《制冷与空调》2014年第8期30-35,共6页Refrigeration and Air-Conditioning

摘　　要：以小型多联机用旋风式油气分离器为研究对象,建立三维稳态数值模型。气流场选用重整化群湍流模型(RNGk-ε),油滴轨迹采用随机轨道(DRW)模型,研究内管长度、筒体高度和进气碰撞程度对油气分离器内部流场分布、分离效率和压降的影响。发现大部分油滴在内管截面以上的筒体空间内完成分离;油气分离器所需内管长度与筒体高度比值随进气速度的增加而减小;进气碰撞程度(油气分离器横截面上内管下边缘与进气管上边壁的垂直距离与进气管径的比值,即h1/di)小于26.57%,进气速度大于23.09 m/s时,更容易获得稳定的旋流流场。A three-dimensional steady-state numerical model of cyclone oil-gas separator used in small size VRF system is established.The RNGk-εmodel is used in gas field and DRW model is used for oil droplets trajectory to study the influences of inner pipe length,column height and inlet-collision on velocity distribution,separation efficiency and pressure loss inside the oil-gas separator.It is found that most oil droplets are separated upon the inner pipe section.The ratio of inner pipe length and column height of high-efficiency oil-gas separator decreases as the increase of inlet velocity.It is easier to get a stable swirl flow field when the collision degree（the ratio of the distance between lower border of inner pipe and upper border of inlet pipe to inlet diameter,namely h1/di）is smaller than26.57%and the inlet velocity is bigger than 23.09 m/s.

关 键 词：多联机 油气分离器 内管长度 进气碰撞 两相流 

分 类 号：TB657[一般工业技术—制冷工程]