直通式真空集热管热性能的数值模拟研究  

Numerical Simulation on Thermal Performance of Straight-through Evacuated Collector Tubes

作　　者：仇秋玲 匡荛[1] 杨帆[1] 刘静静[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《发电设备》2016年第3期148-152,共5页Power Equipment

摘　　要：利用Fluent软件对直通式真空集热管复杂的耦合换热过程进行了数值模拟,建立了集热管的非均匀热流边界条件下的传热模型,并将模拟结果与实验结果进行对比验证;分析得到了非均匀热流边界条件下,辐照强度、传热工质流速和入口温度对吸热管周向温度分布的影响。结果表明:吸热管轴向热流分布极不均匀,吸热管周向温差高达74.5 K。较大的温差会使集热管产生热应力,当超过集热管的屈服强度时,就会引起集热管的破坏,降低使用寿命。The complex coupling heat transfer process of collector tubes was simulated using Fluent software based on the heat transfer model established under the boundary condition of non-uniform heat flux, following which the simulation results were verified by comparison with experimental data. Meanwhile, the effects of irradiation intensity, heat-transfer fluid velocity and inlet temperature on the circumferential temperature distribution around absorber tubes were analyzed under the boundary condition of non-uniform heat flux. Results show that the axial distribution of heat flux is very uneven and the circumferential temperature difference around absorber tubes is up to 74.5 K. Larger temperature difference would bring thermal stress in the collector tube, and when the stress exceeds the yield strength of collector, it would cause damage to the tube, thus reducing its service life.

关 键 词：直通式真空集热管 热性能 热流密度 不均匀热流分布 

分 类 号：TK515[动力工程及工程热物理—热能工程]