超临界二氧化碳太阳能腔式吸热器数值模拟研究  

Numerical Simulation of Supercritical Carbon Dioxide Solar Cavity Receiver

作　　者：熊烈 杨凯 黄晓宏[1,3] 张燕平 李黎[1,2] XIONG Lie;YANG Kai;HUANG Xiaohong;ZHANG Yanping;LI Li(Institute of New Energy,Wuhan Co.,Ltd.,Wuhan 430070,China;School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan 430070,China;School of Energy and Power Engineering,Huazhong University of Science and Technology,Wuhan 430070,China)

机构地区：[1]武汉新能源研究院有限公司,武汉430070 [2]华中科技大学电气与电子工程学院,武汉430070 [3]华中科技大学能源与动力工程学院,武汉430070

出　　处：《动力工程学报》2023年第8期1030-1038,共9页Journal of Chinese Society of Power Engineering

基　　金：湖北省技术创新专项(重大专项)资助项目(2019AAA17)。

摘　　要：针对太阳能碟式聚光器,设计了一种工质为超临界二氧化碳的圆台形腔式吸热器,建立了腔式吸热器的光热模型。采用蒙特卡洛光线追踪法分析了腔式吸热器的光学特性,并基于相关理论,将热边界条件导入Ansys Fluent软件中,对腔式吸热器的光学特性及流动传热特性进行了计算流体力学(CFD)仿真模拟,得到腔式吸热器内工质出口温度、工质流动压降、光学效率、热效率以及散热损失随着工质进口温度(100~200℃)和太阳光辐射强度(400~1200W/m^(2))的变化规律。结果表明:不同太阳光辐射强度下,吸热器的光学效率基本不变;太阳光辐射强度对腔式吸热器热效率的影响不明显;工质进口温度越高,吸热器的热效率越低;腔式吸热器散热损失中,自然对流散热损失最大,其次是辐射散热损失及导热散热损失。A type of supercritical carbon dioxide truncated cone cavity heat receiver was designed and developed for the solar energy disk concentrator.The optic-thermal model of the cavity heat receiver was established,and the optic-thermal characteristics of the cavity heat receiver were analyzed by Monte Carlo ray tracing method.Based on the related theory,the thermal boundary conditions were introduced as the input parameters to import into Ansys Fluent software.CFD simulation was carried out to study the optical characteristics and flow heat transfer characteristics of the cavity heat receiver.The outlet temperature,pressure drop,optical efficiency,thermal efficiency and losses of heat convection,radiation and conduction were obtained under different inlet temperatures(100-200℃)and different solar radiation intensities(400-1200W/m^(2)).Results show that the optical efficiency of the cavity heat receiver remains basically unchanged under different solar radiation intensities.The influence of solar radiation intensity on the thermal efficiency of cavity heat receiver is not significant.The higher the inlet temperature of the working fluid is,the lower the thermal efficiency of the cavity heat receiver is.In the heat losses of cavity heat receiver,natural convection heat loss is the largest,followed by radiation heat loss and heat conduction heat loss.

关 键 词：太阳能 腔式吸热器 超临界二氧化碳 数值模拟 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]