旋流器分选过程示踪球设计及颗粒轨迹数值模拟研究

发布时间：2018-04-19 09:04

本文选题：颗粒轨迹 + 数值模拟　；参考：《中国矿业大学》2015年硕士论文

【摘要】：重介质旋流器是近几年大力发展并广泛应用的一种重介质矿物分选设备,其中的旋流场是一种三维近似轴对称的多相流场,颗粒分离、分选等作用均通过离散相与连续相的相对运动完成。但是,目前针对旋流场的研究,尤其是旋流场内颗粒轨迹的研究还面临着一系列问题。由于旋流器内物料分布受入料压力、矿浆入料量、入料口形状等影响,旋流器内磨损形式复杂,且对旋流场内颗粒运动特性缺乏直观的监测,所以复杂的旋流场使得经验公式和基于具体条件下的数值解不能准确的分析出运动场分布。因此,本文从粒子示踪和CFD数值模拟两方面对重介旋流器内颗粒运动特性进行研究。针对CFD数值模拟,建立了旋流场湍流模型和三相流计算模型。研究了不同粒度、不同密度的颗粒运动轨迹特性,可以直观看到颗粒动向,监测错配物的产生。针对粒子示踪,设计研究了一个可以达到旋流场中示踪粒子性能标准的球体,并保证其能够在旋流器中维持稳定的运动特性;之后开发了一个基于MEMS的微惯性定位系统和存储接收系统的智能示踪球,用于在运动过程中实时采集三轴加速度数据。最后建立了基于加速度积分的轨迹模型和基于频域滤波的数据预处理方法,消除干扰噪声信号和趋势项,使采样数据更接近于真实,进而通过加速度数据2重积分计算并绘制出轨迹曲线。
[Abstract]:Heavy medium cyclone is a kind of heavy medium mineral separation equipment which has been developed and widely used in recent years. The swirl field is a three-dimensional approximate axisymmetric multiphase flow field with particle separation.Sorting and other functions are accomplished by the relative motion of discrete phase and continuous phase.However, there are still a series of problems in the research of swirl flow field, especially the particle trajectory in swirl flow field.Because the distribution of material in the cyclone is affected by the feeding pressure, the amount of slurry and the shape of the inlet, the wear form in the cyclone is complicated, and the movement characteristics of particles in the swirl field are not monitored directly.Therefore, the complex swirl field makes the empirical formula and numerical solution based on specific conditions unable to accurately analyze the distribution of motion fields.Therefore, the particle motion characteristics in the remedium cyclone are studied in terms of particle tracer and CFD numerical simulation.For the CFD numerical simulation, the turbulence model of swirl field and the calculation model of three-phase flow are established.The characteristics of particle trajectories with different particle sizes and densities are studied. The movement of particles can be seen directly and the generation of mismatch can be monitored.For particle tracer, a sphere which can meet the performance standard of tracer particles in the swirl field is designed and studied, and it can maintain stable motion characteristics in the hydrocyclone.Then a micro inertial positioning system based on MEMS and an intelligent tracer ball of storage and receiving system are developed, which are used to collect triaxial acceleration data in real time during the course of motion.Finally, the trajectory model based on acceleration integral and the data preprocessing method based on frequency domain filter are established to eliminate the interference noise signal and trend term, and make the sampling data closer to reality.Furthermore, the trajectory curve is calculated and plotted by the double integration of acceleration data.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD455

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