含空气蒸汽冷凝换热特性的数值模拟分析  

Numerical simulations on steam condensation heat transfer characteristics in the presence of air

作　　者：边浩志 孙中宁 丁铭 张楠 孟兆明 王璐[2] BIAN Haozhi;SUN Zhongning;DING Ming;ZHANG Nan;MEMG Zhaoming;WANG Lu(Fundamental Science on Nuclear Safety and Simulation Technology Laboratory,Harbin Engineering University,Harbin 150001,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]哈尔滨工程大学核安全与仿真技术国防重点学科实验室,黑龙江哈尔滨150001 [2]中国核动力研究设计院核反应堆系统设计技术重点实验室,四川成都610213

出　　处：《哈尔滨工程大学学报》2019年第2期426-432,共7页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(11775060)

摘　　要：为定量考察气体流速、壁面过冷度、换热面高度和气体压力对含空气蒸汽冷凝换热的影响,本文采用数值模拟的方法进行了分析。计算了基于COPAIN试验装置和CFD软件STAR-CCM+中的扩散理论冷凝模型,在主流流速0. 1~3 m/s、壁面过冷度4℃~50℃、换热面高度0. 5~6 m以及气体压力0. 1~0. 6 MPa的条件下讨论了冷凝换热特性。研究表明:冷凝换热系数在主流流速小于0. 5 m/s的自然对流主导区内几乎不受速度的影响,换热系数相对偏差在6. 7%以内;壁面过冷度的幂指数可用空气质量份额和过冷度的函数来表示且幂指数范围为-0. 008 3^-0. 367;换热面高度在1 m以内时对冷凝换热性能有明显影响;不同蒸汽质量份额条件下,冷凝换热系数与压力的0. 64次方成正比。通过对计算结果的分析得到了冷凝传热性能与各影响因素之间的量化关系,这对进一步认识含空气蒸汽冷凝现象有一定的指导意义。Numerical simulations are conducted to quantitatively evaluate the effects of gas velocity,wall sub-cooling,condensation wall height,and gas pressure on condensation heat transfer.The calculations are based on COPAIN experimental facility and diffusion theory-based condensation model incorporated in the CFD software STAR-CCM+.Condensation heat transfer property is evaluated in terms of velocity from 0.1m/s to 3m/s,wall sub-cooling from 4℃to 50℃,condensation wall height from 0.5 to 6 m,and pressure from 0.1 MPa to 0.6 MPa.Results indicate that the condensation heat transfer coefficient is hardly affected by the mainstream gas velocity in the natural convection-dominated region with velocities less than 0.5 m/s.Furthermore,the power exponent of wall sub-cooling can be described by a function in terms of air mass fraction and wall sub-cooling,which ranges from-0.008 3 to-0.367.The condensation wall height has an obvious effect on the condensation heat transfer when it is less than 1 m,and the heat transfer coefficient has a 0.64 power direct proportion to the gas pressure.Via numerical results analysis,the quantitative relationship between the condensation heat tranfer porperty and the influencing parameters were concluded,which can to a certain degree promote the understanding of steam condensaiton phenomena in the presence of air.

关 键 词：不凝性气体 冷凝模型 扩散理论 数值模拟 壁面过冷度 气体压力 气体流速 

分 类 号：TL331[核科学技术—核技术及应用]