摘要
当主流温度高于拟临界温度时,超临界流体为类似气体的流体,故其换热系数相对较低。采用自适应结构化网格,利用商业CFD软件Fluent6.1对简单格架的阻塞面积比对超临界竖直圆管内传热特性的影响进行了模拟。结果表明,RNGk-ε模型配合增强型壁面函数处理可以得到比较准确的结果;格架的阻塞面积比与当地主流温度越高,传热强化效果越好;给出了格架后换热系数强化比的衰减规律。
The heat transfer coefficient is relative low when the bulk temperature is above the pseudo-critical point due to the properties of vapor-like fluid. Numerical simulation on the heat transfer phe-nomena downstream of an obstacle in a vertical tube is carried out with commercial CFD code Fluent 6.1 us-ing adaptive grid. The results show that the RNG k-ε model with enhanced wall treatment can obtain reliable results; and the higher of the blockage ratio and the local temperature can achieve the better heat transfer en-hancement. The influence region and decay trend are also given.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2010年第S1期93-96,108,共5页
Nuclear Power Engineering
关键词
超临界水堆
格架
强化换热
Supercritical water reactor,Obstacle,Enhancement heat transfer
