含微小颗粒气流横掠圆管束表面的沉积特性  

Deposition characteristics of tube bundles in particulate cross-flow

作　　者：唐婵[1,2] 张靖周[3] 

机构地区：[1]南京航空航天大学能源与动力学院,江苏南京210016 [2]南京工程学院能源与动力工程学院,江苏南京211167 [3]南京航空航天大学江苏省航空动力系统重点实验室,江苏南京210016

出　　处：《中南大学学报（自然科学版）》2015年第12期4679-4685,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51276090)~~

摘　　要：基于欧拉-拉格朗日粒子追踪模型和干燥粒子的沉积机制,采用Fluent-CFD软件和自编微粒沉积用户程序对含微小颗粒的气流横掠3×3阵列圆管束表面的粒子沉积特性进行数值研究。研究结果表明:随着粒径或进气气流速度增加,颗粒在管束表面的碰撞率增加,但黏附率降低;管排方式对小粒径颗粒影响较小,对大粒径颗粒影响较大;当粒子直径达到某一值后,尽管对壁面的碰撞能力加剧,但几乎不形成沉积。Based on Euler-Lagrangian particle tracking module and dry particle deposition mechanism, a numerical simulation was made to predict the fine-particle deposition on the tube bundles with 3×3 array arrangement in a particulate cross-flow by using Fluent-CFD software and user-defined functions（UDFs）, taking particles transport, sticking and detachment processes into consideration. The results show that when the particle diameter or inlet gas velocity increases, the particle impact efficiency on the tube-bundles is enhanced while the sticking efficiency is weakened. In relation to small particles, the deposition rate of the large particles is greatly influenced by the arrangement of tube bundles. For larger particles, although the impact capacity is significantly enhanced, almost no deposition occurs.

关 键 词：飞灰颗粒 气-固两相流动 管束 沉积模型 数值模拟 

分 类 号：TK121[动力工程及工程热物理—工程热物理]