旋流分离器中固体颗粒随机轨道的数值模拟及分离特性分析

NUMERICAL SIMULATION OF PARTICALE MOTION TRAJECTORY IN A HYDROCYCLONE USING A STOCHASTIC TRAJECTORY MODEL

在考虑液相与固体颗粒之间相互作用的条件下,对液相采用雷诺应力模型(RSM),固粒采用随机轨道模型成功地模拟出固体颗粒的运动轨迹,这形象地反映出固体颗粒在旋流器中的分离过程。分析颗粒运动迹线表明颗粒粒径、颗粒注入位置以及颗粒在循环流中的流动特性等方面对分离性能都存在着很大的影响;另外,利用底流与溢流排出的颗粒数量比例来确定粒级效率,在与试验值比较后发现两者相近,从而为确定粒级效率提供了又一种方法。

Based on the consideration of the dispersed phase interaction with continuous phase, applying the Reynolds stress model and the stochastic trajectory model to the continuous and dispersed phase, the particle motion trajectory is simulated successfully, which can visually show the separation process in a hydrocyclone. According to the analysis of the particle motion trajectory, the effect factors of the separation performance, such as particle diameter and particle injection region ,as well as particle flow characteristic within circulation stream are known. Besides, using the ratios of the particles quantities in underflow and overflow, the grade efficiency curve can be plotted. The results of the simulation calculation are verified by a comparison of the experimental data with simulation values. Based on these results another plotting method of the grade efficiency curve for engineering handle is provided.