入口弯管结构对重力式油水分离器内流场的影响

The Effects of Entrance Component on the Flow Field in Gravity Type Oil-Water Separator

采用Fluent软件紊流计算中的标准k-ε模型,对安装不同结构参数入口弯管的重力式油水分离器内部流场进行数值模拟,得到含有3个出口位置、4种入射角度和4种不同轴向位置入口弯管的分离器内部流动特性.分析比较研究结果可以得出:入口弯管出口距筒体顶端内壁面越小,筒体对入射流体的阻碍作用越佳,流体通过整流构件后产生的返混区域越小;弯管入射角度在30°、60°和120°时,整流构件后方均产生涡旋,流场紊乱程度大,入射角度为90°时没有涡旋产生,流体流动相对最为平稳;入口弯管越靠近封头,整流构件前涡旋区域越小,整流效果越佳,后部流场轴向流动比例越多,越有利于油水两相分离.

The numerical simulation of the internal flow field of a gravity type oil-water separator with different entrance components was carried out to obtain the internal velocity vector and flow field of a separator of three exit positions,four angles of incidence and four different axial positions of the inlet tube,through the standard k-εmodel of Fluent software for turbulent flow calculation.The analysis of the comparative study results showed that the smaller the distance from the inlet tube exit to the top inner wall of the cylinder,the better the hindrance of the cylinder to the incident fluid,and the smaller the vortex area after the fluid passed through the rectifier.When the angle of incidence was 30°,60°and 120°,the vortex was generated behind the rectifier,and the flow field was turbulent.There was no vortex at 90°,and the fluid flow was relatively stable.The closer the inlet elbow was to the head,the smaller the vortex area in front of the rectifier and the better the rectification effect,and the more the axial flow ratio of the flow field at the rear flow field,the more favorable separation of oil-water phase.