基于CFD方法的PCHE窄小流道内超临界CO2流动传热特性数值研究  

Numerical Investigation on Flow and Heat Transfer Characteristics of S-CO2 in Narrow Space Channel of PCHE Based on CFD Simulation

作　　者：刘贵军 陈德奇[1] 胡练 王俊峰[2] Liu Guijun;Chen Deqi;Hu Lian;Wang Junfeng(Key Laboratory of Low-Grade Energy Utilization Technologies and Systems,Chongqing University,Chongqing,400044,China;Institute of Nuclear Power of China,Chengdu,610213,China)

机构地区：[1]低品位能源利用技术及系统教育部重点实验室,重庆大学,重庆400044 [2]中国核动力研究设计院,成都610213

出　　处：《核动力工程》2019年第3期12-16,共5页Nuclear Power Engineering

基　　金：国家自然科学基金(No.51206199);中央高校基本科研业务费(No.106112017CDJQJ148806)

摘　　要：采用计算流体动力学(CFD)方法对Z字形通道的印刷电路板式换热器(PCHE)的热工水力特性进行了研究,结合物性拟合公式和用户自定义函数(UDF)计算超临界CO2物性;湍流模型采用SST k-ω模型,通过摩擦阻力系数和传热系数的实验数据对方法进行了验证。模拟结果表明,流体在弯折点处,加速核心区域向外侧壁靠近;在弯折点下游,存在较大压降,且随分离流的减弱而减小。CFD method was used to investigate the thermal hydraulic characteristics of the printed circuit heat exchangers(PCHE)with zigzag channels,and the physical parameters of supercritical CO2 was calculated by combining the physical property fitting formulas and the user defined function(UDF).In addition,the turbulent flow model was based on the SST k-ωmodel,and the CFD method was validated by the experimental data of friction coefficient and heat transfer coefficient.Simulation results show that in the zigzag channels of PCHE,the core accelerating area moves toward the outside wall at the bending point,and the separated flow area becomes narrow as the pressure drop decreases at the downstream part of the bending point.

关 键 词：超临界CO2 印刷电路板式换热器(PCHE) 流动换热特性 

分 类 号：TL331[核科学技术—核技术及应用]