飞灰颗粒横掠管束的沉积特性数值研究  

Computational Analysis of Ash Particulate Deposition on 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 [2]南京航空航天大学能源与动力学院 [3]南京航空航天大学江苏省航空动力系统重点实验室

出　　处：《电站系统工程》2016年第1期1-4,共4页Power System Engineering

基　　金：国家自然科学基金(51276090)的资助

摘　　要：为了揭示飞灰颗粒在管簇式换热器表面的沉积分布,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:飞灰颗粒在管壁表面的碰撞率和黏附率与管束排布和粒径有关,飞灰颗粒的黏附率随着粒径的减小而增大。In order to reveal the ash particle deposition distribution in heat exchanger tube bundles, the particulate transport and deposition of the particle-laden flow crossing tube bundles were numerically calculated by using the Lagrangian stochastic tracking model and the particle deposition model presented by El-Batsh and Haselbacber. The tube arrangements and the particle size have important effects on particle trajectories and deposition. Results illustrate that the collision rate and the deposition rate of particles on the tube surface are related to the tube bundle arrangement and particle size. As the particle size decreases, particle deposition rate increases as well as the sedimentary area expands.

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]