高温工况下管内S-CO_(2)强迫对流换热实验研究  

Experimental Study on S-CO_(2) Forced Convection Heat Transfer in Tubes under High-temperature Condition

作　　者：谢榕顺 张广旭 赵弟宏 卢功豪 洪钢 张尧立 XIE Rongshun;ZHANG Guangxu;ZHAO Dihong;LU Gonghao;HONG Gang;ZHANG Yaoli(College of Energy,Xiamen University,Xiamen 361105,China;Fujian Research Center for Nuclear Engineering,Xiamen 361105,China)

机构地区：[1]厦门大学能源学院,福建厦门361105 [2]福建省核能工程技术研究中心,福建厦门361105

出　　处：《原子能科学技术》2023年第9期1761-1770,共10页Atomic Energy Science and Technology

基　　金：能源学院发展基金(2018NYFZ01);先进能源科学与技术广东省实验室委托项目:2020—2030广东省能源体系发展战略研究(FWSQHT-20211119-00022)。

摘　　要：由于超临界二氧化碳(S-CO_(2))动力循环对能源转化利用具有重要意义,许多研究人员对S-CO_(2)对流换热特性进行实验研究。然而现有研究集中在低温工况(10~200℃),高温工况(200~500℃)的实验数据匮乏。本文通过实验研究高温工况下竖直管内S-CO_(2)对流换热特性,分析热加速效应以及浮升力效应对传热的影响。结果表明,高温工况下S-CO_(2)的传热变化趋势类似于气态CO_(2),但在数值上有很大不同,同时热加速以及浮升力效应对高温S-CO_(2)传热的影响忽略不计。最后通过对几种典型经验关联式在高温工况下的预测能力进行评价分析,结果与实验数据有很大差异,因此本文提出适用于高温S-CO_(2)传热的经验关联式,它提供了更高精确度,能满足实际工程需要。Under high-temperature conditions,supercritical carbon dioxide(S-CO_(2))power conversion systems have significant advantages,which show great potential in improving energy utilization efficiency,reducing environmental pollution,and realizing sustainable energy development.S-CO_(2),as a high-efficiency working fluid,can achieve high efficiency in higher temperature thermodynamic cycles,which helps to reduce fuel consumption and greenhouse gas emissions.Since the S-CO_(2) power cycle is significant to energy conversion and utilization,many researchers have conducted experimental studies on the convective heat transfer characteristics of S-CO_(2).However,existing studies mainly focus on low-temperature condition(10-200℃),and experimental data under high-temperature condition(200-500℃)are scarce.Most of the research conditions on the heat transfer characteristics of S-CO_(2) have not reached the optimal temperature range of the S-CO_(2) power conversion system,in order to master the critical data of the relevant design,it is necessary to carry out experimental research on the heat transfer characteristics of S-CO_(2) under high heat flux conditions,which holds a crucial significance in the development of associated power conversion systems.This paper first introduced the construction process of the S-CO_(2) forced circulation test bench,and evaluated the uncertainty of the relevant experimental data.The main temperature range of the experiment is 450-800 K,the pressure range is 7.40-10.22 MPa,and the heat flux range is 20-1000 kW/m^(2).The heat transfer characteristics of S-CO_(2) in a vertical tube under high-temperature conditions were studied experimentally,and the effects of thermal acceleration and buoyancy on heat transfer were analyzed.The results show that the heat transfer trend of S-CO_(2) is similar to that of gaseous CO_(2) under high-temperature conditions,but the values are quite different,and the influence of thermal acceleration and buoyancy effect on the heat transfer of high-temperature S-CO_(2)

关 键 词：超临界二氧化碳 高温工况 热加速效应 浮升力效应 经验关联式 

分 类 号：TL332[核科学技术—核技术及应用]