摘要
为研究气力输砂系统中惯性分离元件的性能,采用欧拉-拉格朗日方法数值模拟了平面形底边、三角形底边和半圆形底边3种分离元件的流场和颗粒撞击特性,并对比分析了不同风速时,3种分离元件的分离效率和阻力特性。研究结果表明,分离元件底边形状对气流阻力、颗粒运动轨迹及其与壁面碰撞次数有很大影响,平面底边分离元件的分离效率随风速的提高下降幅度较大,因而仅适用于低速情况;三角形底边元件分离效率及其对风速的适应性均有很大改善;而半圆形底边分离元件分离效率最佳,并且基本不受来流速度影响。因此,当风速较高时应考虑优先采用三角形底边或半圆形底边分离元件。研究结果对类似气力输砂系统分离器的设计及优化具有指导意义。
In order to obtain the performance of inertia separator in the sand/dust test system, the flow field and particles＇ impact characters about three kinds of separate components are studied by numerical simulation based on Euler-Lagrange method, then the separate efficiency and resistance characters under various main flow velocity are analyzed. The results indicated that, the shape of separate components＇ bottom affect the air flow resistance, the moving trajectories of particles, the amount of impact between particles and separator wall seriously. The separate efficiency of separate component with a flat bottom decreased obviously along with the increase of air velocity, so this kind of component should be used only in the occasions where the air velocity is low. The efficiency and the flexibility to the air velocity of separate component with a triangle bottom are improved greatly. The separate efficiency of component with a semicircular bottom is the highest among these three kinds of components studied in this paper, and is affected by the incoming air flow velocity slightly. So the component with a triangle or semicircular bottom is recommended to be used in case of the air velocity is relative high. The study results provide reference for the design and optimization of separator which is purposed to be used in similar pneumatic feeding system.
出处
《计算机与应用化学》
CAS
CSCD
北大核心
2013年第3期319-321,共3页
Computers and Applied Chemistry
关键词
气力输砂
惯性分离器
气固两相流
CFD
砂尘试验
pneumatic sand/dust feeding
inertia separator
gas/solid two-phase flow
CFD
environmental test
