超临界受热面水侧颗粒沉积的数值模拟研究  

Numerical Simulation of Particle Deposition on Supercritical Heating Surface

作　　者：曾子轮 王超[1] 李鸿源[1] 黎宇航 徐鸿[1] ZENG Zilun;WANG Chao;LI Hongyuan;LI Yuhang;XU Hong(MOE's Key Laboratory of Power Station Energy Transfer Conversion and System,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学电站能量传递转化与系统教育部重点实验室,北京102206

出　　处：《动力工程学报》2022年第9期806-811,共6页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2018YFB0604402);中央高校基本科研业务费专项资金资助项目(2019MS015)。

摘　　要：为明确汽水侧的沉积物在流场中的运动规律,采用离散项模型对细长光滑水平圆管进行数值模拟。基于实验数据,对跨临界流动的湍流模型进行对比分析,并结合离散项模型,根据结晶动力学定义颗粒入射几何面,在壁面全捕捉与全反射2种极限壁面条件下分析颗粒在壁面的沉积规律。结果表明:Realizable k-ε模型适用于超临界水的湍流模拟,颗粒在壁面的沉积规律受流场影响且与颗粒粒径密切相关;小粒径颗粒主要受流场作用,且与壁面的碰撞频率更高,而大粒径颗粒主要受自身重力影响,这种特性有利于颗粒集中沉积;热泳力对于小粒径颗粒的影响更明显。In order to clarify the motion law of the sediment in the flow field on the vapor side,the slender smooth horizontal circular tube was numerically simulated via a discrete term model.The turbulence model for cross-critical flow was compared and analyzed based on experimental data.Combined with the discrete term model,the particle incident geometric surface was defined according to the crystallization kinetics.And the deposition law of particles on the wall surface was analyzed under two limiting conditions of total capture and total reflection of the wall.Results show that the Realizable k-εmodel is applicable for the turbulence simulation of supercritical water,and the deposition pattern of particles on the wall is affected by the flow field and is closely be related to the particle size.Small particles are mainly affected by the flow field and the collision frequency with the wall is higher,while the large particles are mainly affected by their own gravity which is benificial to the concentrated deposition of particles.The effect of thermophoresis force on small particle size is more obvious.

关 键 词：超(超)临界机组 湍流模型 颗粒沉积 热泳力 

分 类 号：TK124[动力工程及工程热物理—工程热物理]