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在DSG槽式太阳能聚光器运行过程中,吸热管外表面的热流分布不均易导致吸热管损坏,将严重影响系统的安全。文章以实际辐照为边界热流条件,对集热器吸热管两相区和干蒸汽区截面上的温度分布规律进行了二维数值研究。在稳态条件下,分析了管内不同压强、工质温度和流型对管壁温度场分布的影响。结果表明:压强和温度对干蒸汽区管壁最大周向温差无明显影响,压强较高时两相区管壁温度场分布更均匀;管内为层流时,管壁温度场分布比管内为环流时更不均匀,且整体温度更高。
During the operation of the DSG trough solar concentrator, the uneven distribution of the heat flux on the outer surface of the heat absorption pipe can easily lead to the damage of the heat absorption pipe, which will seriously affect the safety of the system. In this paper, the actual radiation as the boundary conditions of heat flow, the two-phase numerical study of the temperature distribution in the cross-section of two-phase zone and dry steam of the heat-absorbing tube of the collector. Under steady-state conditions, the influence of different pressure, working fluid temperature and flow pattern on the temperature distribution in the pipe wall was analyzed. The results show that pressure and temperature have no significant effect on the maximum circumferential temperature difference of the pipe wall in dry steam. When the pressure is higher, the distribution of temperature field in the two-phase wall is more uniform. When more uneven, and the overall temperature is higher.