热平衡法在S-CO_(2)管内流动换热实验中的应用与改进  

Application and Improvement of the Heat Balance Method in Flow and Heat Transfer Experiments within S-CO_(2)Flow Channels

作　　者：张帮辉 高明[1] 任燕 杨其国 ZHANG Banghui;GAO Ming;REN Yan;YANG Qiguo(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai,China,Post Code:200093)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《热能动力工程》2024年第8期137-145,共9页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金(51976127)。

摘　　要：为了解决S-CO_(2)水平管内流动换热实验中由于管道周向温度分布不均匀而导致的内壁温计算误差问题,将原有的热平衡法进行了改进,基于体积发热率法计算内热源项,并对底层节点温度进行再计算。结果表明:改进的热平衡法扩展了原有热平衡法的适用范围,使之能够应用于水平管交流电加热情况,计算得到的内壁面温度更接近精确值。In order to solve the problem of calculation errors in the inner wall temperature due to uneven circumferential temperature distribution in S-CO_(2)horizontal tube during flow and heat transfer experiments,the original thermal balance method has been improved.The internal heat source term is calculated based on the volumetric heating rate method,and the temperature of the bottom node is recalculated.The results show that the improved thermal balance method extends the applicability of the original thermal balance method,allowing it to be applied to AC electric heating in horizontal tubes.The calculated inner wall temperature is closer to the accurate value.

关 键 词：超临界二氧化碳 实验 换热 热平衡法 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]