燃气中颗粒在换热表面沉积特性  

Particle Deposition Characteristics on Heat Transfer Surfaces inside Particulate Flow

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,南京211167 [2]南京航空航天大学能源与动力学院,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,南京210016

出　　处：《燃气轮机技术》2016年第2期15-20,共6页Gas Turbine Technology

基　　金：国家自然科学基金(51276090)

摘　　要：研究Stokes数对颗粒在换热器壁面捕获及沉积的影响,采用欧拉-拉格朗日方法及El-Batsh和Haselbacher提出的粒子沉积模型模拟稀疏气固两相流,讨论了颗粒横掠受热表面的沉积分布。结果表明:不管是改变粒径还是改变流速导致的St数变化,对颗粒沉积特性都有影响;St数减小,圆管周向的颗粒沉积量增加,沉积区域增大且分布均匀;St数减小到一定程度,顺叉排管束对沉积影响的区别减小。The Stokes number have been studied to obtain the relationship between wall capture and particle deposition by using EulerLagrangian method and the particle deposition model presented by El-Batsh and Haselbacher to simulate 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 Stokes number,which caused by the change of whether the particle size or the flow velocity,has a great influence on the particle deposition; As the decrease of the Stokes number,the deposition rate of the tube wall surface and the circumferential particle deposition area of the pipe increase; there is a little difference in deposition rate between staggered and in-lined tube bundles when the Stokes number below a certain value.

关 键 词：颗粒 气固两相流动 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]