折线流道纵向节距对工质流动传热的影响及新型关联式构建  

Effect of Longitudinal Pitch on Flow and Heat Transfer Characteristics of Working Fluid in Zigzag-type Channels and Development of New Correlations

作　　者：高成 刘生晖 洪光伟 黄彦平[2] 朱小良 GAO Cheng;LIU Shenghui;HONG Guangwei;HUANG Yanping;ZHU Xiaoliang(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,School of Energy and Environment,Southeast University,Nanjing 210096,China;CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology,Chengdu 610041,China)

机构地区：[1]东南大学能源与环境学院能源热转换及其过程测控教育部重点实验室,南京210096 [2]中国核动力研究设计院中核核反应堆热工水力技术重点实验室,成都610041

出　　处：《工程热物理学报》2024年第10期3160-3169,共10页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.12105046)。

摘　　要：折线型印刷电路板式换热器具有强化传热能力,是超临界二氧化碳布雷顿循环中回热器的重要候选对象之一。本文就折线流道纵向节距长度对工质流动换热特性的影响规律和新型传热关联式进行了研究。在研究工况参数范围内,30°折线流道纵向节距在3倍到11倍流道直径范围内增加时,对流传热能力变化较小,纵向节距进一步增加到13倍流道直径时,其对流传热能力下降;10°折线流道纵向节距在3倍到13倍流道直径范围内增加时,其对流传热能力逐渐增加。分析表明,该现象主要由折线流道弯折处二次流的产生、转移和耗散所引起。进一步构建了包含纵向节距的新型宽适用范围传热关联式。Zigzag-type Printed Circuit Heat Exchanger(PCHE)with enhanced heat transfer capability are one of the promising candidates for recuperator in supercritical carbon dioxide Brayton cycle.In this study,flow and heat transfer characteristics in zigzag-type PCHE is studied with different longitudinal pitch.Results show that the convective heat transfer performance of 30°zigzag-type PCHE varies less when the longitudinal pitch increases from 3 to 11 times of channel diameter,and decreases when the longitudinal pitch increases to 13 times of channel diameter;the convective heat transfer performance of 10°zigzag-type PCHE increases gradually when the longitudinal pitch increases from 3 to 13 times of channel diameter.These phenomena are mainly caused by the generation,convection,and dissipation of secondary flow at the corner of the zigzag channels.In this paper,a new kind of heat transfer correlation combined with longitudinal pitch is further proposed.

关 键 词：折线型印刷电路板式换热器 纵向节距 超临界二氧化碳 流动换热 关联式 

分 类 号：TK124[动力工程及工程热物理—工程热物理]