摘要
应用ANSYS建立以超临界CO2为循环工质的螺旋管腔式太阳能吸热器的热-力耦合模型,得到不同能流分布形式下的温度场和应力场。依据Mendelson-Roberts-Manson方法,研究不同能流分布对吸热管预期使用寿命的影响。研究表明,能流分布形式对吸热器温度和应力分布及其使用寿命影响显著。在保持系统吸收总能量不变的情况下,吸热器表面局部能流越大,其局部温度越高,局部蠕变损伤加剧,影响系统使用寿命;局部能流梯度越大,其热应力越大,加剧局部蠕变破坏,影响其使用寿命。
A thermo-mechanical coupling model for helical tube cavity solar receiver with supercritical CO2 as working fluid was developed by using ANSYS.The temperature fields and stress fields under the different flux density distributions were obtained.By using the Mendelson-Roberts-Manson method,the effect of flux density distribution on the expected service life of the receiver was studied.The results show that the energy flow distribution has a significant effect on the temperature and stress distribution of the heat absorber and its service life.In the case of maintaining the total energy absorbed by the system,the local energy flow of the heat sink surface is larger,the local temperature is higher and the local creep damage is aggravated,which affects the service life of the system.A high local energy gradient results in the increases in thermal stress and local creep damage,affecting its service life.
作者
刘敏
饶政华
刘继雄
廖胜明
Liu Min;Rao Zhenghua;Liu Jixiong;Liao Shengming(School of Energy Science and Engineering,Central South University,Changsha 410012,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2020年第4期92-98,共7页
Acta Energiae Solaris Sinica
基金
湖南省自然科学基金(2016JJ2144)。
关键词
超临界CO2
能流分布
腔式太阳能吸热器
热-力耦合
蠕变-疲劳分析
supercritical CO2
energy flux distribution
cavity solar receiver
thermo-mechanical coupling
creep-fatigue analysis
