Aiming at the research on distribution rule of particles’volume fraction in oil⁃water hydrocyclone,the numerical simulation software CFD(computational fluid dynamics),based on the combinative application of turbulence RSM(Reynolds stress model)and multiphase mixture model,is used to simulate particles’volume fraction and separation efficiency of discrete phase with single⁃diameter particles and various⁃diameter particles,respectively,obtaining oil⁃phase nephogram,particles’volume frac⁃tion and separation efficiency curves. Results of the comparative analysis of above nephogram and curves show that the separation of oil with water mainly occurs within the cone section of hydrocyclone,and the magnitude of oil⁃core nearby axe changes with the vari⁃ety of particle sizes. Big particles trend to be separated because of great radial force,while little particles trend to escape from the underset jaw because of great resistance generated by water phase,thereby the bigger the sizes are and the higher the separation effi⁃ciency is. This structure of hydrocyclone is more efficient for separating oil particles of diameter bigger than 30μm.% 为了研究油-水旋流器颗粒体积分数分布规律,应用计算流体力学数值模拟软件CFD,将湍流雷诺应力模型和多相流混合模型相结合,分别对单一直径颗粒分散相和由不同直径颗粒组成的分散相中颗粒体积分数和粒级效率进行模拟计算,得到油相云图、颗粒体积分数和粒级效率曲线。对比分析结果表明：油-水分离主要在锥段进行,轴心油核的大小随颗粒直径的变化而不同；大颗粒受到径向力作用大,容易分离；小颗粒受到水相阻力作用大,易从底流口排出；颗粒直径越大,分离效率越高。该结构旋流器对直径大于30μm颗粒分离效率较高。
展开▼
