摘要
并联矩形通道间的流动不稳定性现象广泛存在于能源动力、石油和化工等工业系统。对于耦合传热并联矩形通道,其流动传热特性与分离并联矩形通道存在一定差异。为进一步获得耦合传热并联矩形通道的流动不稳定性特性,该文采用系统分析程序RELAP5对已有实验本体进行建模,并基于已有矩形通道流动不稳定性数据开展了计算方法验证,在此基础上探索了并联耦合通道流动不稳定性规律,并对比研究了分离通道与耦合通道的不稳定性边界。结果表明:耦合通道与分离通道的不稳定性边界相近,通道间传热减弱了耦合通道流量振荡幅值,对系统稳定性具有一定的增强作用。
[Objective]Rectangular channels are widely used in energy power,petroleum,and chemical systems due to their compact structure and high heat exchange efficiency.In heat exchangers and reactor cores that use rectangular flow channels,the channels are separated from each other,which could result in instability phenomena under certain working conditions.Existing research shows that the coupling structure can distribute heat among the channels based on their respective heat transfer characteristics.Heat conduction through the wall can reduce the wall temperature fluctuations,reduce peak wall temperatures in the dried-out state,and improve the stability of the system.Given the fact that wall coupling heat transfer between parallel channels improves system stability,this study aims to explore the influence of coupled heat transfer on the flow instability of parallel rectangular channels,which has high research value.[Methods]In this paper,the thermal-hydraulic program REALP5/MOD3.3 was used to analyze the flow instability characteristics of the parallel channel,and the independent and coupled heating conditions were realized by changing the thermal components.The objects used in this paper are parallel rectangular channels with a heating length of 1000 mm and a cross-section of 40.0 mm × 2.0 mm;a coupled heat transfer wall with 40.0,2.0,and 1000.0 in width,thickness,and height,respectively;an axial grid size of 40 mm in size;and a grid size of 0.5 mm in the direction of the thickness of the coupled heat transfer wall.The influence of the coupled heat transfer on the flow instability of parallel channels was studied based on the ratio of heat transfer of the coupling wall and the heat transfer inside the fluid medium during a flow oscillation cycle.Accordingly,the influence of thermal parameters such as system pressure,mass flow rate,and inlet subcooling of the parallel-channel system coupled with heat transfer on the flow instability boundary parameters was studied.[Results](1)The heat transfer through the coupling hea
作者
胡钰文
闫晓
宫厚军
王艳林
周磊
HU Yuwen;YAN Xiao;GONG Houjun;WANG Yanlin;ZHOU Lei(CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology,Nuclear Power Institute of China,Chengdu 610041,China)
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第8期1257-1263,共7页
Journal of Tsinghua University(Science and Technology)
