微小颗粒横掠圆管的数值分析  

Numerical analysis of tiny particles sweep round tube bundles

作　　者：唐婵[1,2] 张靖周[2,3] 

机构地区：[1]南京工程学院能源与动力工程学院,江苏南京211167 [2]南京航空航天大学能源与动力学院,江苏南京210016 [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：《热科学与技术》2015年第6期497-504,共8页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51276090)

摘　　要：利用拉格朗日粒子随机追踪模型以及El-Batsh和Haselbacher提出的粒子沉积模型,对飞灰颗粒横掠管束时的运动轨迹和沉积特性进行了数值研究,获得了管束排布方式以及粒子直径对飞灰颗粒运动轨迹及沉积分布的影响。结果表明:当颗粒的直径小到一定程度时,管束通道内的流场和温度分布对颗粒的运动轨迹影响显著;颗粒在管壁表面的碰撞率和沉积率与管束排布和粒径有关,粒径50.0μm颗粒几乎没有沉积;粒径10.0μm颗粒沉积主要分布在管壁迎风面;粒径1.0μm的颗粒在管壁的迎风面和背风面都有沉积。The particulate transport and deposition of particle-laden flow crossing tube bundles were numerically calculated using the Lagrangian stochastic tracking model and the particle deposition model presented by E1-Batsh and Haselbacher. The results illust the part smaller icle size have important effects on particle trajectories and rate that th deposition. than a certain value, the particle trajectories are significantly affected e tube arrangements and When the particle size is by the flow field and the temperature distribution inside tube bundles. The collision rate and the deposition rate of particles on the tube surface are related to the tube bundle arrangement and particle size. Almost no deposition of particle diameter of 50 μm;deposition area of particle size of 10 μm are mainly distributed in windward side while particle size of 1 μm are distributed in all the windward and leeward side.

关 键 词：颗粒 气固两相流动 管束 沉积模型 

分 类 号：TK121[动力工程及工程热物理—工程热物理]