单侧加热方形通道内超临界水传热研究  

Numerical investigation on heat transfer of supercritical water in a side-heated square channel

作　　者：黄志豪 李光熙[2] 唐桂华[1] 李小龙[1] 范元鸿 HUANG Zhihao;LI Guangxi;TANG Guihua;LI Xiaolong;FAN Yuanhong(Key Laboratory of Thermo-Fluid Science and Engineering,Ministry of Education,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;Xi’an Aerospace Propulsion Institute,Xi’an 710100,Shaanxi,China)

机构地区：[1]西安交通大学热流工程与科学教育部重点实验室,陕西西安710049 [2]西安航天动力研究所,陕西西安710100

出　　处：《化工学报》2022年第4期1523-1533,共11页CIESC Journal

基　　金：国家自然科学基金项目(51825604,51721004)。

摘　　要：数值模拟了辅助冷却剂超临界水在单侧加热方形通道中的流动传热特性,从边界层厚度与近壁区湍动能两方面阐述传热恶化产生和恢复的机理。研究了不同工况(压力、入口温度、热通量、质量流量、流动方向和管径)下超临界流体常用传热关联式的适用性,发现Fan关联式预测精度较高。采用PEC因子对不同强化传热结构(双通道和凹槽)进行评价,发现上下双通道PEC因子普遍小于1,综合强化换热效果不佳,而偏下游的非对称倒角凹槽结构PEC因子为1.13~1.51,不同工况下均为最大值。场协同原理分析也证明偏下游的非对称倒角凹槽结构具有最佳的综合换热性能。The heat transfer of supercritical water in a side-heated square channel with auxiliary coolant is numerically investigated,and the mechanisms of heat transfer deterioration and recovery are explained in terms of boundary layer thickness and turbulent kinetic energy in the near-wall region.The heat transfer correlations for supercritical water heat transfer in a side-heated square channel under different conditions(pressure,inlet temperature,heat flux,mass flow,flow direction and pipe diameter)are examined and the Fan correlation achieves the highest prediction agreement.The PEC factor is employed to evaluate different enhanced heat transfer structures(dual channels and grooves).It is found that the PEC factor of upper and lower dual channel is generally less than 1,and the overall heat transfer enhancement is low.The PEC factor of the downstream asymmetric chamfered groove is in the range of 1.13-1.51,and the maximum value is achieved under different working conditions.The field synergy analysis also proves that the down stream asymmetric chamfered groove structure has the best comprehensive heat transfer performance.

关 键 词：数值模拟 超临界水 传热 关联式 强化结构 

分 类 号：TK121[动力工程及工程热物理—工程热物理]