超临界CO_(2)/R41混合工质在螺旋槽管内冷却流动传热特性的数值研究  

Numerical Study on Flow and Heat Transfer Characteristics of Supercritical CO_(2)/R41 Mixtures in Spirally Fluted Tube

作　　者：林智博 陶乐仁[1] 邱晗 杜登高 麻毓窈 LIN Zhibo;TAO Leren;QIU Han;DU Denggao;MA Yuyao(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Zhengzhou University of Economics and Business,Zhengzhou 450099,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093 [2]郑州经贸学院,郑州450099

出　　处：《动力工程学报》2022年第9期793-799,共7页Journal of Chinese Society of Power Engineering

基　　金：上海市动力工程多相流与传热重点实验室资助项目(13DZ2260900)。

摘　　要：为降低超临界CO_(2)的工作压力并强化传热,在恒热流冷却工况下对螺旋槽管内超临界状态下CO_(2)和CO_(2)/R41混合工质的流动传热过程进行了数值模拟,分析了热流密度、质量流速和倾斜角度等因素对流动传热过程的影响。结果表明:相较于超临界CO_(2),超临界CO_(2)/R41混合工质在临界压力差更大的情况下,其最大传热系数提高了7.7%,且传热系数衰减幅度更小;螺旋槽管在高温区的传热系数相较于低温区有明显提升,且热流密度越大,传热系数越大;受浮升力影响,倾斜角度小于0°时传热系数较大,倾斜角度在45°~90°时会发生传热恶化,且倾斜角度为-45°~45°时凹槽处会形成涡旋。In order to reduce the working pressure of supercritical CO_(2) and enhance heat transfer,the flow and heat transfer process of CO_(2) and CO_(2)/R41 mixtures under supercritical state in the spirally fluted tube was numerically simulated under constant heat flow cooling conditions,so as to analyze the effects of heat flux,mass flow rate and inclination angle on flow and heat transfer process.Results show that the maximum heat transfer coefficient of CO_(2)/R41 is 7.7%higher than that of supercritical CO_(2) and the decay rate of heat transfer coefficient is lower,even its critical pressure difference is larger.The heat transfer coefficient of the spirally fluted tube is obviously improved in high temperature region than that in low temperature region,and the greater the heat flux is,the greater the heat transfer coefficient would be.Affected by the buoyancy force,the heat transfer coefficient is larger when the inclination angle is less than 0°,while heat transfer deterioration will occur when inclination angle varies from 45°to 90°,and vortices will be formed in the range of-45°-45°.

关 键 词：超临界CO_(2) 混合工质 螺旋槽管 对流传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]