物性对换热表面颗粒沉积特性的影响  

Effect of material properties on particle deposition characteristics on heat transfer surfaces

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：《热力发电》2015年第12期80-86,共7页Thermal Power Generation

基　　金：国家自然科学基金项目(51276090)

摘　　要：为了研究飞灰颗粒和管壁材料的物理性质对换热器壁面颗粒沉积特性的影响,采用欧拉-拉格朗日方法及EI-Batsh和Haselbacher提出的粒子沉积模型模拟稀疏气固两相流,进而分析飞灰颗粒横掠圆管束时受热表面的颗粒沉积分布。结果表明:杨氏模量对颗粒的沉积影响很大,粒径较大时,杨氏模量的增加颗粒在壁面沉积率降低,粒径较小时,杨氏模量对沉积的影响减弱;壁面材料杨氏模量的影响程度比颗粒杨氏模量稍弱;颗粒密度增大,沉积率降低。To investigate the effects of such parameters as physical properties of fly ash particle and heating surface,and particle velocity on wall capture and particle deposition in the heat exchangers,the Euler-Lagrangian method and the particle deposition model presented by EI-Batsh and Haselbacher were applied to simulate the dilute gas-solid two phase flow.The deposition distribution of ash particles flow crossing the heating tube bundles has been discussed.The results show that the Young＇s modulus has a great influence on the particle deposition.For the larger particle size,the Young＇s modulus is larger,deposition rate of particles on the wall is lower.For the smaller particle size,the effect of deposition of Young＇s modulus is weakened.The influence of the Young＇s modulus of surface material is a bit weaker than the Young＇s modulus of particles.As the particle density increases,the deposition rate decreases.

关 键 词：换热器 圆管 飞灰颗粒 气固两相流动 顺排管束 叉排管束 杨氏模量 颗粒密度 沉积特性 

分 类 号：TK121[动力工程及工程热物理—工程热物理]