烟气转换阀流场特性及颗粒随机轨道的数值模拟  

Numerical Investigation on Characteristics of Dispersed Two-phase Flows and Particle Motion Trajectory in Flue Dust Change-over Valve

作　　者：贲可存[1] 汤文成[1] 徐鸿翔[1] 吴晶华[1] 

机构地区：[1]东南大学,南京211189

出　　处：《中国机械工程》2008年第12期1410-1414,共5页China Mechanical Engineering

基　　金：江苏省科技成果转化专项资金资助项目(BA2005036)

摘　　要：运用计算流体动力学(CFD)方法对烟气转换阀中的离散两相流场进行了数值模拟。在考虑气相与颗粒固相之间相互作用的前提下,对气相采用带旋流修正的k-ε模型,对颗粒固相采用随机轨道模型,成功地模拟出颗粒的运动轨迹。计算结果表明:阀体内的流场分布可分为4个区域,每个区域内的压力和速度分布存在明显不同的特征;另外,颗粒粒径、颗粒在入口的初始位置对颗粒运行轨迹和时间有很大的影响。该方法为阀体结构的优化设计提供了理论依据。Computational fluid dynamics（CFD） simulations of dispersed two--phase flow through a flue dust change--over valve（FDCV） were performed. Based on the consideration of the dispersed phase interaction with continuous phase, applying the k--ε model and the stochastic trajectory model with to the gas phase and solid phase, the particle motion trajectory was simulated successfully. According to the results of the simulations,the flow field in the FDCV can be divided into four zones and each zone has the distinct different characteristics of pressure and velocity distribution. Besides, particle diameter and particle injection region affect the particle motion trajectory considerably. The method proposed presents the vital theory basis of optimum design of FDCV structures.

关 键 词：离散两相流 k—ε模型 随机轨道 数值模拟 

分 类 号：TF321[冶金工程—冶金机械及自动化] TK121[动力工程及工程热物理—工程热物理]