动态液-液旋流分离器油滴运动轨迹模拟

摘要

Aiming at the separation process of oil⁃water two phases within dynamic liquid⁃liquid hydrocyclone,and accord⁃ing to fundamental equations of fluid mechanics,Reynolds stress model(RSM),QUICK difference scheme and SIMPLE algorithm are adopted to simulate the flow field within the dynamic liquid⁃liquid hydrocyclone. And on this basis,the trajectories of oil drop⁃lets and the distribution of oil phase concentration are simulated by discrete model and multiphase flow model. The simulation re⁃sults show that the trajectories of oil droplets and the distribution of oil phase concentration are closely bound up with the droplet size of oil droplets;large size oil droplets more easily gather to the center of hydrocyclone and form oil core,and the shape of oil core is directly related to the size of oil droplet. The main separation process within dynamic liquid⁃liquid hydrocyclone is completed in the rotary bowl,and its separation efficiency of oil phase raises with the augment of oil droplet’s diameter.%　　针对动态液-液旋流分离器油、水两相过程，从流体力学基本方程出发，采用雷诺应力模型、QUICK差分格式和SIMPLE算法模拟分析动态液-液旋流分离器内的流场；并以此为基础，采用离散相模型和多相流模型，模拟油、水两相分离过程和油滴运动轨迹。模拟结果表明：油滴粒径决定其在旋流分离器中的运动轨迹、速度及分离特性，大粒径油滴更易于向中心聚集形成油芯，油芯的形状与油滴的大小直接相关；动态液-液旋流分离器的主要分离过程在转筒内完成，油相分离效率随着油滴粒径的增大而提高。